Learn by playing. Conquer the world.

A free quiz game for kids, adults and seniors: battles for map regions, 1v1 duels, timed Storm modes and interactive anatomy quizzes. Available in 12 languages.

Learning

Human body

Body overview

• Organs Quiz — Test the new interactive anatomy screen with hover highlights, organ colors, and click-to-guess rounds.
• Skeleton (layered) — Front-view skeleton: skull, rib cage, limbs and the four regions of the spine. Hover names, then play click-to-guess rounds.

Skeletal system

• Skull (front view) — Front-view skull: ten bones from the frontal and parietal to the zygomatic, maxilla and mandible. Hover names, then play click-to-guess rounds.
• Skull (side view) — Side-view skull: eleven bones, including the occipital the front view cannot show. Hover names, then play click-to-guess rounds.
• Anatomy of the shoulder — Shoulder in section: thirteen structures, from the clavicle, acromion and scapula to the rotator cuff and the biceps tendon. Hover names, then play click-to-guess rounds.
• Anatomy of the knee — Knee from the front: fourteen structures, from the femur, patella and meniscus to the cruciate and collateral ligaments. Hover names, then play click-to-guess rounds.
• Anatomy of the skull base and brain — The brain from below beside the floor of the skull: twelve cranial nerves, from the olfactory to the hypoglossal, and eleven openings in the floor of the skull, from the cribriform plate and the optic canal to the foramen magnum. Hover names, then play click-to-guess rounds.
• Anatomy of the wrist and hand — A deeper palmar dissection of the right hand: twenty structures, from the thenar and hypothenar muscles through the tendon sheaths, the annular and cruciform parts of the fibrous sheath and the fascia over the adductor to the ulnar artery and nerve, the common and proper palmar digital vessels and nerves, and the thenar and midpalmar spaces. Hover names, then play click-to-guess rounds.
• Long bone — A long bone on end, the upper shaft cut away to the medullary cavity and the periosteum peeled back over the nutrient artery: fourteen structures – the proximal and distal epiphyses, the metaphyses, the diaphysis, the articular cartilage, the spongy bone, the epiphyseal line, the red and yellow bone marrow, the endosteum, the compact bone, the medullary cavity, the periosteum and the nutrient artery. Hover the names, then play clicking rounds.
• Joint — A synovial joint in section: eleven structures – the extensor and flexor muscles, the tendon and its entheses, the ligament, the epiphyseal bone and the articular cartilage, the synovial cavity, the bursa, the joint capsule and its synovial membrane. Hover the names, then play clicking rounds.
• Pelvis — The bony pelvis from the front, the right hip bone coloured by its three bones and the left left white: thirteen structures – the sacrum and the coccyx, the ilium, the ischium and the pubis with its body, superior and inferior rami and tubercle, the pubic symphysis, the acetabulum, the obturator foramen and the linea terminalis. Hover the names, then play clicking rounds.

Muscular system

• Muscular system quiz — Frontal EMG diagram: click the green electrode pairs for major superficial muscles, then play click-to-guess rounds.
• Muscular system (back) quiz — Posterior EMG diagram: green pairs for surface sites on the back, yellow dots for fine-wire references—same play mode as the frontal diagram.
• Head anatomy — The head from the front with the skin off, painted by Patrick J. Lynch: forty seven structures – the galea, the frontalis, the temporalis and the temporoparietalis, the orbicularis oculi and oris, the procerus and the nasalis, the levators of the upper lip, the zygomatici, the buccinator, the masseter, the depressors of the mouth corner and the lower lip, the mentalis, the digastric, the sternocleidomastoid, the trapezius and the sternohyoid, the parotid gland and the buccal fat pad, the eyeball, the auricle, the nasal cartilages, the lips, the hyoid and the larynx, and sixteen arteries and veins from the superficial temporal and supratrochlear vessels through the angular, facial, labial and submental ones, the external carotid and the retromandibular vein to the external and anterior jugular veins. Hover the names, then play clicking rounds.
• Calcaneal tendon — The back of the leg and heel in Gray's engraving: ten structures in Latin – the soleus, the plantaris tendon, the calcaneal tendon, the calcaneus with the fat pad under it, the three tendons behind the medial malleolus (tibialis posterior, flexor digitorum longus, flexor hallucis longus), the fibularis tendons behind the lateral one, and the foot. Printed names you can switch off, names on hover, and click rounds.

Nervous system

• Nervous system quiz — Interactive diagram of the human nervous system: brain, spinal cord, and major nerves. Click-to-guess rounds like the organ quiz.
• Spine and spinal cord — The spinal cord and spinal nerves inside the spine (CRUK diagram): find the vertebrae C1–C7, T1–T12, L1–L5, the sacral vertebrae S1–S5 and the coccyx. Hover names, then play click-to-guess rounds.
• Anatomy of the brain — Brain from the left: nine structures, from the four lobes and the two central gyri to the cerebellum, medulla oblongata and spinal cord. Hover names, then play click-to-guess rounds.
• Anatomy of the limbic system — Brain in section: six structures, from the cingulate gyrus and corpus callosum to the thalamus, hypothalamic nuclei, amygdala and hippocampus. Hover names, then play click-to-guess rounds.
• Anatomy of the brain arteries — The base of the brain from below: eleven arteries, from the circle of Willis and the internal carotid to the basilar, the three cerebellar arteries and the anterior spinal. Hover names, then play click-to-guess rounds.
• Anatomy of the brain's membranes — A section through the top of the skull: fourteen structures, from the dura, the arachnoid and the pia and the two spaces between them to the sagittal sinus, the arachnoid granulations and four veins. Hover names, then play click-to-guess rounds.
• Reticular formation — The brain in sagittal section with the reticular formation: thirteen structures – the reticular formation, the radial projections to the cortex, the visual and auditory impulses, the ascending pathways of general sensation (touch, pain, temperature) and the descending motor projections to the spinal cord, with the cerebrum, the cerebellum, the brainstem, the spinal cord, the eyeball, the optic nerve and the pituitary gland for bearings. Hover the names, then play clicking rounds.
• Structure of a nerve — A peripheral nerve opened along its length beside a magnified cross section of one fascicle: seven structures — the spinal nerve, the epineurium, the fascicle, the perineurium, the axons, the endoneurium and the blood vessels. Hover the names and click through the rounds.
• Basal ganglia — The deep grey matter seen through the cortical surface, drawn by Colder B: ten structures – the cerebral cortex with the motor and sensory association areas marked on it, the striatum, both segments of the globus pallidus, the thalamus, the subthalamic nucleus, the substantia nigra and the amygdala. Hover the names, then play clicking rounds.

Senses

• Anatomy of the ear — Cross-section of the ear: thirteen structures, from the auricle to the cochlea and the nerves. Hover names, then play click-to-guess rounds.
• Anatomy of the eye — Schematic eye: seventeen structures, from the cornea and iris to the retina, macula and optic nerve. Hover names, then play click-to-guess rounds.
• Anatomy of the visual pathway — From the eyes to the occipital cortex: sixteen structures, from the retina and optic nerve through the chiasm, the crossed and uncrossed fibers and the optic tract to the geniculate bodies, the nuclei of the eye-muscle nerves and the visual cortex. Hover names, then play click-to-guess rounds.

Skin and appendages

• Skin anatomy — A section through the skin: twenty three structures from the epidermis, dermis and hypodermis through the horny and basal layers and the hair with its follicle and arrector, to the sebaceous and sweat glands, the touch corpuscles, the nerves and the vessels. Hover the names, then play clicking rounds.
• The fingernail — The fingernail seen from above with the plate taken off its right half, beside a sagittal section of the same fingertip, drawn by Hariadhi: eleven structures – the nail plate and its free edge, the lunula, the cuticle, the proximal and the lateral nail folds, the nail bed, the germinal matrix, the hyponychium, the distal phalanx and the pulp of the fingertip. The plate, the nail fold, the bed and the matrix are drawn in both views and light in both at once. Hover the names, then play clicking rounds.

Cardiovascular system

• Cardiovascular system quiz — Explore a circulatory diagram with clickable hotspots for the heart and major vessels, then play click-to-guess rounds.
• Anatomy of the heart — A frontal section through the heart: eighteen structures, from the endocardium, the myocardium, the epicardium and the pericardium through the four chambers and the four valves to the aorta, the venae cavae and the coronary vessels. Hover names, then play click-to-guess rounds.
• Blood vessels — An artery and a vein cut open side by side with the capillary bed between them, drawn by Kelvinsong: sixteen structures – the artery and the vein themselves, the arteriole, the capillary, the venule and the thoroughfare channel, and the layers of the wall round the lumen, from the endothelium through the internal elastic lamina, the basement membrane, the smooth muscle and the external elastic lamina to the adventitia, with the venous valve, a red blood cell and a pericyte. Five of them are drawn on both vessels and light in both at once. Hover the names, then play clicking rounds.

Respiratory system

• Respiratory system — The respiratory tract: from the nasal cavity and the larynx through the trachea and bronchi to the lobes of both lungs, the diaphragm and the alveolus. Hover names, then play click-to-guess rounds.
• Lung pleurae — The thorax from the front with the right chest wall in place and the left lung exposed, and an inset of the seam between lung and wall: twelve structures – the left and right lungs, the trachea, the sternum, the ribs, the costal cartilages, the intercostal muscles, the diaphragm, the pleural sac, and in the inset the visceral pleura, the pleural cavity and the parietal pleura. Hover the names, then play clicking rounds.
• Larynx — The larynx from the front and side after Gray's Anatomy, drawn by Olek Remesz: twenty-one structures – the hyoid bone, the thyrohyoid membrane with its median and lateral ligaments and the triticeal cartilage, the thyroid cartilage with its superior notch, both horns and the oblique line, the superior laryngeal nerve and artery, the median cricothyroid ligament and the conus elasticus, the cricothyroid muscle, the cricoid cartilage and the cricothyroid joint, the cricotracheal ligament and the trachea with its cartilages and anular ligaments. Hover the names, then play clicking rounds.
• Pulmonary alveoli — The end of the airways after LadyofHats's diagram: eleven structures – the respiratory bronchiole with its mucosa and mucous glands, the alveolar duct, two alveolar sacs, one cut open to its atrium and alveoli, the capillary network, the branches of the pulmonary artery and vein, and the connective tissue around them. Hover the names, then play clicking rounds.

Mouth and teeth

• Tooth anatomy — A section through a molar in its socket: thirteen structures from the enamel, dentin and pulp chamber through the gingiva, the cementum and the periodontal ligament, to the jaw bone, the dental nerve and its two vessels, with the crown, the neck and the root bracketed down the margin. Hover the names, then play clicking rounds.
• Oral cavity anatomy — A midsagittal section of the head, the one place the airway and the alimentary canal cross: twenty six structures from the lips, the incisors, the oral vestibule and the oral cavity proper, through the hard and the soft palate with the uvula, the dorsum of the tongue, the genioglossus, the lingual tonsil, the geniohyoid, the mandible and the hyoid bone, to the nasal septum, the frontal and the sphenoid sinus, the nasopharynx with its pharyngeal tonsil and the opening of the Eustachian tube, the oropharynx and the laryngopharynx, and down past the epiglottis to the trachea and the esophagus. Hover the names, then play clicking rounds.
• Salivary glands — The salivary glands on a see-through head, a Blausen Medical 3D render: six structures – the parotid gland and its duct, the submandibular and sublingual glands, and the teeth and cervical vertebrae for bearings. Hover the names, then play clicking rounds.
• Dental notation — CMG Lee's comparison of dental notations, with Gray's engraved teeth: twenty-eight fields – the permanent and the deciduous dentition, the four quadrants, five notation systems (alphanumeric, Palmer, ISO 3950/FDI, the Universal numbering system and the palaeoanthropological one) and every tooth class and position from the central incisor to the wisdom tooth. Hover the names, then play clicking rounds.

Digestive system

• Digestive system anatomy — The whole alimentary canal on one chart: thirty structures from the palate, the uvula, the tongue and the teeth and the three salivary glands, through the pharynx, the esophagus, the stomach, the liver, the gallbladder and the bile duct, the pancreas and its duct, to the duodenum, the jejunum and the ileum and the colon from the cecum and the appendix round to the rectum and the anus, with the mouth, the salivary glands and the small and large intestine bracketed down the margin. Hover the names, then play clicking rounds.
• Rectum anatomy — A section through the rectum and the anal canal: nineteen structures from the sigmoid colon, the peritoneum and the three transverse folds through the ampulla, the prostate, the levator ani and both sphincters, to the cavernous body, the venous plexus, the dentate line, the anal crypts, the pecten and the anus, with the anal canal bracketed down the middle. Hover the names, then play clicking rounds.
• Biliary system — The liver and its bile ducts from the front: twenty structures from the intrahepatic ducts, the left and right hepatic ducts, the common hepatic duct, the cystic duct and the common bile duct through the sphincter of Oddi and the major duodenal papilla to the gallbladder, the two lobes of the liver, the pancreas with its main and accessory ducts, the duodenum and the jejunum, with the stomach, the spleen, the esophagus and the kidneys for bearings. Hover the names, then play clicking rounds.
• Stomach wall — The stomach from the front with its wall magnified: ten structures — the mucosa, the submucosa, the muscle layers and the serosa of the wall in section, and the esophagus, the fundus, the body, the rugae, the pylorus and the duodenum on the organ. Hover the names, then play clicking rounds.
• Blood supply of the stomach — The stomach from the front with the arteries of both curvatures: sixteen structures from the abdominal aorta and the celiac trunk through the left gastric artery, the common and proper hepatic arteries with the right gastric, the gastroduodenal and its superior pancreaticoduodenal branch, the splenic artery with the short gastric arteries and both gastroomental arteries along the greater curvature, with the stomach, the esophagus, the duodenum and the spleen for bearings. Hover the names, then play clicking rounds.
• Stomach — The stomach in section: sixteen structures from the esophagus, the cardia, the fundus, the body, the pyloric antrum and the pyloric canal to the pyloric sphincter and the duodenum, with the serosa and the three layers of the muscularis externa (longitudinal, circular and oblique), the lumen with the rugae of the mucosa, and the lesser and greater curvatures. Hover the names, then play clicking rounds.
• Layers of the GI tract — A segment of the gut wall opened in steps: twenty structures from the lumen, the epithelium, the lamina propria and the muscularis mucosae of the mucosa with its lymphoid nodules and glands, through the submucosa with its glands and Meissner's plexus, the circular and the longitudinal muscle with Auerbach's plexus between them, to the serosa with its connective tissue and mesothelium, the mesentery and the artery, the vein and the nerve it carries. Hover the names, then play clicking rounds.
• Stomach emptying — The stomach emptying into the duodenum in three steps: eleven structures — the esophagus, the stomach, the acidic chyme, the pyloric sphincter, the duodenum and its alkaline mucus at rest; the sphincter opening, the peristaltic wave and the chyme flowing into the duodenum; the sphincter closing and the small amount of chyme neutralized by the mucus. Hover the names, then play clicking rounds.
• Pancreas — The pancreas from the front with the duodenum cut open round its head, the gallbladder and the bile ducts above it and the duct tree drawn through the gland: fifteen structures – the gallbladder, the cystic duct, the right, left and common hepatic ducts, the common bile duct, the pancreatic duct and its accessory duct with the major and minor duodenal papillae, the duodenum, and the head, body, tail and lobules of the pancreas. Hover the names, then play clicking rounds.
• Liver vascular anatomy — The liver's blood supply in three drawings – the organ from the front with the inferior vena cava, the aorta, the hepatic veins, the coeliac trunk with the splenic, common, proper, right and left hepatic arteries, the portal vein with the splenic and superior mesenteric veins and its right and left branches; a hepatic lobule with its central vein, sinusoids and portal triads; and a sinusoid with its portal venule, arteriole, bile ductule and canaliculus, endothelial, Kupffer and stellate cells: thirty structures. Hover the names, then play clicking rounds.
• Appendix — The digestive tract in the torso from the front with the vermiform appendix marked, drawn by Olek Remesz: thirteen structures – the esophagus, the stomach, the duodenum, the jejunum and ileum, the cecum, the appendix, the ascending, transverse, descending and sigmoid colon, the rectum, the anus and the taeniae coli. Hover the names, then play clicking rounds.
• Large intestine — The digestive tract in the torso from the front with the six parts of the large intestine in Olek Remesz's own colours: fifteen structures – the cecum and the appendix, the ascending colon and the right colic flexure, the transverse colon and the left colic flexure, the descending and sigmoid colon, the rectum, the anal canal and the taeniae coli, with the esophagus, the stomach, the duodenum and the small intestine around them. Hover the names, then play clicking rounds.

Urinary system

• Kidney — A kidney in frontal section: seventeen structures – the fibrous capsule with its superior and inferior poles, the cortex, the renal columns and the pyramids with their papillae, the minor and major calyces, the renal pelvis and the ureter, the renal artery and vein with the interlobular arteries and veins, the hilum and a nephron. Hover the names, then play clicking rounds.
• Urinary system — The kidneys, the ureters and the bladder in the abdomen, drawn by Jordi March i Nogué: fourteen structures – the urinary system itself, the kidney, the renal pelvis, the ureter, the bladder and the urethra, the adrenal gland, the renal artery and vein, the inferior vena cava, the abdominal aorta and the common iliac vessels, with the liver, the large intestine and the pelvis seen through the body. Hover the names, then play clicking rounds.

Reproductive system

• Sperm cell anatomy — A human sperm cell in overview and in two detail views: twenty four structures from the head, the midpiece and the tail through the acrosome and the nucleus with its envelope and vacuoles, to the centriole, the connecting piece, the mitochondria, the outer dense fibers, the axoneme and the central pair. Hover the names, then play clicking rounds.
• Clitoris anatomy — The clitoris drawn whole, most of it hidden under the vulva: nine structures from the glans, the body and the hood with its frenulum, through the corpus cavernosum, the crus and the vestibular bulb, to the external urethral orifice and the vaginal opening. Hover the names, then play clicking rounds.
• Male reproductive system — A sagittal section of the male pelvis: nineteen structures from the testis, the epididymis and the scrotum through the vas deferens, the seminal vesicle, the ejaculatory duct, the prostate and the bulbourethral gland to the bladder, the urethra and its external orifice, the corpus cavernosum, the corpus spongiosum and the glans, with the pubic bone, the suspensory ligament, the deep perineal pouch, the rectum and the anus for bearings. Hover the names, then play clicking rounds.
• Female reproductive system — A frontal view of the female pelvis, sectioned on the left and with its vessels on the right: twenty-four structures from the ovaries, the tubes with their fimbriae and the ovarian ligaments through the fundus, body and cavity of the uterus, the cervix and the vagina to the vulva, the labia and the clitoris with its crura and bulbs, with the uterine and ovarian vessels, the ureters, the hip bone and the femur for bearings. Hover the names, then play clicking rounds.
• Penis cross section — The penis cut across the shaft, layer by layer: thirteen structures from the skin, the dartos fascia, the areolar tissue, Buck's fascia and the tunica albuginea, through the superficial and deep dorsal veins, the dorsal arteries and nerves and the deep arteries, to the corpora cavernosa, the corpus spongiosum and the urethra. Hover the names, then play clicking rounds.
• Testicle — A testis in its scrotum from the side with the front cut away: fifteen structures – the spermatic cord, the cremaster muscle and the scrotum, the tunica vaginalis and its cavity, the tunica albuginea and the septa, the lobules with their seminiferous tubules, the straight tubules, the rete testis and the efferent ductules, and the head, body and tail of the epididymis with the ductus deferens. Hover the names, then play clicking rounds.
• Breast anatomy — The breast in sagittal section, painted by Patrick J. Lynch: eight structures – the chest wall, the pectoralis muscles, the lobules of the mammary gland, the nipple, the areola, the lactiferous ducts, the fatty tissue and the skin. Hover the names, then play clicking rounds.
• Prostate — The prostate in three-quarter view, drawn by Mikael Häggström: ten structures – the gland itself, its peripheral, central and transitional zones and the anterior fibromuscular stroma, the seminal vesicle, the ampulla of the vas deferens, the ejaculatory duct and the prostatic and penile urethra. Hover the names, then play clicking rounds.
• Fetus in the uterus — A fetus at term in the uterus in sagittal section, after Gray's plate: ten structures — the fetus and its head, the placenta, the umbilical cord with its vein and arteries, the amniotic cavity, the amnion, the uterine wall and the cervix. Hover the names and click through the rounds.
• Female inner genitalia — The uterus, the tubes, the ovaries and the vagina in frontal section, drawn by Sciencia58: fourteen structures – the ovary, the infundibulum and the fallopian tube, the ovarian ligament, the myometrium, the endometrium and the uterine cavity, the body of the uterus, the cervix with its internal os, canal and vaginal part, the vaginal vault and the vagina. Hover the names, then play clicking rounds.
• Muscles of the perineum — The pelvic floor seen from below in both sexes, drawn by OpenStax: fifteen structures – the penis and the clitoris, the ischiocavernosus and the bulbospongiosus, the vestibule, the urethra and the vagina, the transverse perineal muscles and the perineal body, the anus with its external sphincter, the levator ani, the coccyx, the gluteus maximus and the subcutaneous fat. Nine of them are drawn in both figures and light in both at once. Hover the names, then play clicking rounds.

Endocrine glands

• Endocrine system — Two figures and two magnified insets: nine glands from the pineal and the pituitary in the brain through the thyroid with its parathyroids and the thymus to the adrenals on the kidneys, the pancreas, the ovaries and the testes, with the kidney, the uterus, the larynx and the trachea for bearings. Hover the names, then play clicking rounds.
• Neuroendocrine system — A head in profile with the four glands of the brain and the neck and the hormones each releases: the hypothalamus with its eight releasing and inhibiting hormones, the pineal gland with melatonin, the pituitary with the hormones of its anterior, posterior and intermediate lobes, and the thyroid with T3 and T4, with the cerebrum, the corpus callosum, the brainstem, the cerebellum, the hyoid bone, the larynx and the trachea for bearings. Hover the names, then play clicking rounds.
• Thyroid from the front — The larynx, the thyroid gland and the great vessels of the neck from the front: fifteen structures – the hyoid bone, the epiglottis, the thyrohyoid membrane, the thyroid and cricoid cartilages, the cricothyroid muscles and their median ligament, the right and left lobes of the thyroid with the isthmus, the trachea, the superior thyroid arteries and the common, external and internal carotid arteries. Hover the names, then play clicking rounds.
• Adrenal gland in section — The adrenal gland in cross section with a magnified wedge of the gland, from the capsule down to the medulla: twelve structures in Latin – the gland itself and its fibrous capsule, the cortex with its glomerular, fascicular and reticular zones, the medulla, the central vein, the medullary veins and the suprarenal arteries, the renal surface of the gland and the superior pole of the kidney under it. Printed names you can switch off, names on hover, and click rounds.

Histology

• Epithelium types — Four drawings by Kamil Danak from Wikimedia Commons on one grid: simple squamous, simple cuboidal and simple columnar epithelium and pseudostratified columnar epithelium. Each block shows the cell nuclei and the basement membrane the epithelium rests on – pointing at a nucleus lights the nuclei in all four drawings, pointing at a cell its whole epithelium. Latin labels show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.
• Blood cell formation (hematopoiesis) — Human hematopoiesis after A. Rad's and Mikael Häggström's Wikimedia Commons diagram: thirty-five cells in Latin – the hematopoietic stem cell, the common myeloid and lymphoid progenitors, the megakaryocyte line down to the platelets, the red cell line from the proerythroblast to the reticulocyte and the red blood cell, the granulocytes from the myeloblast through the promyelocyte, myelocyte, metamyelocyte and band cell to the neutrophil, eosinophil and basophil, the monocytes with the macrophage and a dendritic cell, the mast cell, and the lymphocytes from the lymphoblast to the B and T lymphocyte, the plasma cell and the natural killer cell. The English labels of the original diagram are replaced by Latin labels that show a translation on hover. A cell drawn more than once lights up everywhere at once. Toggleable names in the diagram, names on hover and clickable rounds.
• Transverse section of bone — A transverse section of the compact bone of a fibula under the microscope (×250) after BDB's and Nyq's drawing on Wikimedia Commons, redrawn from Gray's Anatomy: six structures in Latin – two osteons (Haversian systems) with their central canals and lamellae, the interstitial lamellae between them, the osteocytes and the bone canaliculi. The English labels of the original image are replaced by Latin labels that show a translation on hover. A structure drawn more than once lights up everywhere at once. Toggleable names in the diagram, names on hover and clickable rounds.
• Neuron structure — The structure of a nerve cell after Mariana Ruiz Villarreal's (LadyofHats) diagram on Wikimedia Commons: twenty-seven structures in Latin – the dendrites, the cell body with its cell membrane, nucleus and nucleolus, Nissl substance, ribosomes and polyribosomes, Golgi apparatus, smooth endoplasmic reticulum, mitochondria and microtubules, the axon hillock, the axon in its myelin sheath of Schwann cells with their nuclei and nodes of Ranvier, the axon terminal and three kinds of synapse; in the magnified synapse the synaptic vesicles, neurotransmitter, synaptic cleft and receptors, and in the cut-open axon its microfilaments and microtubules. The English labels of the original diagram are replaced by Latin labels that show a translation on hover. A structure drawn more than once lights up everywhere at once. Toggleable names in the diagram, names on hover and clickable rounds.
• Muscle tissue — Skeletal, smooth and cardiac muscle side by side, from Mdunning13's drawing on Wikimedia Commons: striated fibres with their sarcolemma and peripheral nuclei, spindle-shaped smooth muscle cells with a central nucleus, and branching cardiac cells with an intercalated disc. Pointing at a cell lights just that one; pointing at the striations or the central nuclei lights them in every panel at once. The numbers of the original drawing are replaced by Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.
• Skeletal muscle structure — A skeletal muscle from its tendon down to single fibres, after Marek M's Wikimedia Commons diagram based on Deglr6328's Skeletal muscle.jpg: the muscle and its tendon, the epimysium around the whole muscle, the fascicles in their perimysium and the muscle fibres with the endomysium between them. Seven structures in Latin that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.
• Neuromuscular junction close-up — The neuromuscular junction up close, after Dake's drawing (vectorised by Mrmw) on Wikimedia Commons: eight structures in Latin – the presynaptic terminal of a motor axon with its synaptic vesicles and mitochondria, the synaptic cleft, the sarcolemma with its junctional folds, the acetylcholine receptors and the sarcoplasm of the muscle fibre. The numbers of the original picture are replaced by Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.
• Sarcomere — A skeletal muscle sarcomere after David Richfield's drawing on Wikimedia Commons, relaxed and contracted: the Z- and M-lines, the I and A bands, the H zone, the thin actin and thick myosin filaments with the myosin heads and tails, titin and CapZ. Every part lights up in both drawings at once, so you can see what shortens in a contraction and what keeps its length. The original English labels are replaced by Latin ones that show a translation on hover. Toggle names on the diagram, see names on hover and play click rounds.
• Animal cell structure — The structure of an animal cell after Mariana Ruiz Villarreal's (LadyofHats) diagram on Wikimedia Commons: twenty-three structures in Latin – the plasma membrane, the cytoplasm, the nucleus with its nuclear envelope, nuclear pores, chromatin and nucleolus, the rough and the smooth endoplasmic reticulum, free and bound ribosomes, the Golgi apparatus with its vesicles, a secretory vesicle, the mitochondria, a lysosome, the peroxisomes, the centrosome with its two centrioles, the cytoskeleton of microtubules, intermediate filaments and microfilaments, and the flagellum. Where a structure is drawn more than once, every copy lights up at once. The English labels of the original diagram are replaced by Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.

Animals

Cat

• Cat skeleton — The cat's skeleton in profile: twenty-three structures in Latin – eighteen bones from the skull and lower jaw through the shoulder blade, the breastbone, the ribs and the bones of both pairs of limbs to the pelvis, and the five stretches of the spine the author banded in colour: seven cervical, thirteen thoracic, seven lumbar, three sacral and nineteen to twenty-one caudal vertebrae. Printed names you can switch off, names on hover, and click rounds.
• Cat anatomy — The cat's internal organs in profile: twenty-one structures in Latin – the brain and spinal cord, the nasal and buccal cavities, the windpipe, the gullet, the lung and the heart, the diaphragm, the liver with its gallbladder, the stomach, the spleen, the kidney, the ureter, the bladder and the urethra, the gut ending at the anus, and the testis with its ductus deferens. Printed names you can switch off, names on hover, and click rounds.
• Cat's tongue — A cat's open mouth from the front: thirteen structures in Latin – the four kinds of papilla (filiform, fungiform, circumvallate and foliate), the dorsum of the tongue, the hard palate and the gum, the incisors, canines and cheek teeth, the nose leather, the whiskers and the upper lip. Printed names you can switch off, names on hover, and click rounds.

Dog

• Dog skeleton — The dog's skeleton in profile: thirty-one structures in Latin — twenty-six bones from the cranium, maxilla and mandible through the shoulder blade and its spine, the sternum, the ribs and their cartilages to the hip bone, the ischium and the bones of both pairs of limbs, and the five regions of the spine the author marked with colour bands: seven cervical vertebrae including the atlas and the axis, thirteen thoracic, seven lumbar, three sacral and twenty to twenty-three caudal. Toggleable names on the diagram, names on hover and clickable rounds.
• Dog's internal organs — A dog in profile with its body wall opened, in a colour lithograph from 1905: twenty-four structures in Latin – nineteen the author numbered himself (the spine and the ribs, the nostrils, the lower jaw, the gullet, the windpipe, the heart, the left lung, the liver, the stomach, the small intestine, the descending colon, the bladder, the left kidney, the rectum, the ureter, the testis, the prostate, the penis and the prepuce), and five more the plate draws but does not name: the skull, the limb bones, the greater omentum, the muscles and the skin. Printed names you can switch off, names on hover, and click rounds.
• Muscles of the dog's forelimb — The dog's right forelimb from the front after the DBCLS (TogoPic) plate on Wikimedia Commons: sixteen structures in Latin – the extensors of the forearm (extensor carpi radialis and ulnaris, common and lateral digital extensors) with their tendons, the long abductor of digit I crossing the tendons above the carpus, the carpal bones, the dewclaw (digit I), digits II to V with their claws and the interosseous muscles of the metacarpus. The plate names nothing; the Latin labels are the card's own reading and show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.
• Muscles of the dog's right forelimb (lateral) — The dog's right forelimb from the lateral side after the DBCLS illustration on Wikimedia Commons: twenty-three structures in Latin – the triceps brachii with its tendon, the olecranon and the anconeus, the lateral epicondyle of the humerus; on the forearm the extensor carpi radialis, the common and lateral digital extensors, the extensor and flexor carpi ulnaris, the abductor digiti I longus and the extensors' tendons; on the paw the distal ulna, the carpal bones with the accessory carpal bone, the metacarpal bones, the interosseous muscles, the abductor of the fifth digit, the dewclaw, the digits and the claws. The illustration carries no labels; the Latin labels are the card's own reading and show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.
• Anatomy of the dog's lymph vessels — The lymph vessels of the dog's skin on Baum's lithograph from the Anatomischer Anzeiger (1917): a Great Dane from the left side with the skin off, the superficial muscles bared and the injected lymph vessels converging on the parotid, mandibular, superficial cervical, axillary, inguinal and popliteal nodes – fifty-two structures in Latin: the cheek muscles, the masseter, the cutaneous muscles of the neck and the trunk, the trapezius, the omotransversarius, the supraspinatus, the brachiocephalicus and the deltoid, both heads of the triceps, the cephalic and the saphenous veins, the superficial gluteal, the biceps femoris and the semitendinosus, the eyelids, the fold of the flank, six lymph nodes and fifteen groups of lymph vessels under Baum's numbering, plus the head, the ear, the limbs, the prepuce and the tail for bearings. Baum's letters and numbers stay on the picture and his key sits under it as Latin labels that show a translation on hover; the challenge hides the key. Toggleable names on the diagram, names on hover and click-to-answer rounds.

Horse

• Horse skeleton — The horse's skeleton in profile: thirty-six structures in Latin — ten on the head, from the cranium, the orbit and the nasal bone through the malar bone, the infraorbital foramen and the facial crest to the incisive bone, the maxilla, the teeth and the mandible; the five stretches of the spine from the cervical vertebrae to the caudal; the ribs; the scapula with its spine; the humerus, radius and ulna, the carpal bones, the cannon bone, the sesamoids and the three phalanges; and the pelvis, femur, patella, tibia and fibula, the calcaneus and talus, the tarsal bones and the hind cannon. Most of them are drawn twice, once per limb, and both light at once. Names in the diagram and names on hover can be switched on or off, and the rounds are answered by clicking.
• The horse's foot — Six drawings of one foot on a single 1922 lithograph – the digit from behind with the hoof removed, a vertical mesial section, the arteries of the digit, the ground surface of the hoof, the digit from the side and a section through the horn. Thirty one structures in Latin: the bones and joints of the digit including the navicular, both flexor tendons and the flexor sleeve, the corium of the sole, the wall and the frog, the coronary cushion, the perioplic ring and the digital cushion, the hoof wall, the white line, the sole, the frog with both its sulci, the bar, the bulb of the heel, the horny laminae and the periople, the digital artery, the terminal arch, the coronary circle and the solar branches. Eleven of them are drawn on two or three of the figures and light up together. Toggleable names on the diagram, names on hover and clickable rounds.
• The horse's heart — The heart and great vessels of the horse from the right, on a 1922 lithograph (McFadyean, Plate XXIV): thirty-nine structures in Latin – the posterior, common and anterior aorta, five intercostal arteries, the bronchial, broncho-oesophageal and oesophageal arteries, the azygos vein, both venae cavae, the pulmonary veins, the sinus venosus and the right auricle, both ventricles with both coronary arteries, the trachea with both bronchi and the oesophagus, and at the neck the costocervical trunk and vein, the arteria innominata, the vertebral artery and vein, the common carotid, the bicarotid trunk, the jugular vein, the axillary artery and vein, the superficial cervical artery and the external and internal thoracic vessels. The plate's printed English names are erased and replaced with Latin chips that translate on hover. Toggleable names in the diagram, names on hover, and clickable rounds.
• The horse's muscles — A horse in profile with the skin removed, in John Andrew's 1857 engraving for George H. Dadd's Anatomy and Physiology of the Horse: 70 structures in Latin – the muscles of the head from the orbicularis oculi, the lip levators and the caninus to the masseter; the splenius, the brachiocephalicus and the sternocephalicus on the neck; the supraspinatus, infraspinatus, deltoid and triceps on the shoulder; the extensors and flexors of the forearm; the intercostals, the serrate, pectoral and abdominal oblique muscles on the trunk; the glutei, the biceps femoris, the semitendinosus, the tensor fasciae latae, the quadriceps and the calf on the hind limb; the tendons and joints of all four legs, the hooves, the veins and the tail. The engraver's own letters stay on the plate. Names in the diagram and names on hover can be switched on or off, and the rounds are answered by clicking.
• The side of the horse's face — The side of the horse's face with the skin taken off the cheek, on a 1922 lithograph (McFadyean, Plate XXIX): twenty-six structures in Latin – the masseter with the parotid gland, the parotidoauricular muscle and the masseteric vessels, the facial nerve and its plexus on the masseter, the transverse facial vessels, the facial artery and vein with the parotid duct at the edge of the jaw, the superior and inferior labial arteries, the malar, angular and lateral nasal vessels, both levators of the upper lip, the caninus, zygomaticus, buccinator and orbicularis oris, the depressor of the lower lip, and for bearings the eye, the nostril, the ear and the cut edge of the skin. The plate's printed English names are erased and replaced with Latin chips that translate on hover. Toggleable names in the diagram, names on hover, and clickable rounds.
• The horse's neck from the side — The left side of the horse's neck from the ear to the shoulder with the skin taken away, on a 1922 lithograph (McFadyean, Plate XXVIII): thirty-nine structures in Latin – the trachea and the oesophagus, the common carotid with the vagosympathetic cord and the recurrent laryngeal nerve, both thyroid arteries and the thyroid gland, the jugular vein, the brachiocephalic, omohyoid and sternomandibular muscles, the sterno-thyro-hyoideus, the longus capitis and longus colli, the trapezius with the accessory nerve, the prescapular lymph nodes with the superficial cervical artery, the band of the cervical panniculus, and at the head the carotid's division into the external and internal carotid and the occipital artery, the auricular, transverse facial, masseteric and facial arteries and the facial, glossopharyngeal, vagus and hypoglossal nerves with the sympathetic trunk, plus the parotid and mandibular glands and the larynx. The printed English names are rubbed out of the picture and replaced by Latin labels that show the translation on hover. Toggleable names on the diagram, names on hover and click-to-answer rounds.
• The horse's abdominal wall — The right abdominal wall of the horse with the skin reflected from the elbow to the stifle, on a 1922 lithograph (McFadyean, Plate XXXIX): seventeen structures in Latin – the fleshy part of the external oblique under the ends of the ribs, the serratus, the oblique's aponeurosis down to the linea alba with the umbilicus and the prepuce, and in the groin the inguinal ligament, the superficial inguinal ring with the spermatic cord and the external pudendal artery with the subcutaneous abdominal artery and the cranial artery of the penis, plus the reflected skin, the front of the chest and the limbs. The printed English names are rubbed out of the picture and replaced by Latin labels that show the translation on hover. Toggleable names on the diagram, names on hover and click-to-answer rounds.
• The horse's pectoral region — The pectoral region of a horse on its back with one fore limb drawn up and the skin reflected, on a 1922 lithograph (McFadyean, Plate I): twenty-four structures in Latin – the cephalic vein with the accessory cephalic vein, the superficial cervical artery and the supraclavicular nerves in the groove between the brachiocephalic muscle and the descending pectoral, the transverse pectoral, the subclavius, the sternal band of the cutaneous colli, and on the trunk the ascending pectoral with the cutaneous trunci, the superficial thoracic (spur) vein and the lateral thoracic nerve, plus the reflected skin and, for bearings, the head, the ear, the mane, the neck, the thorax, the belly with the prepuce, the raised fore arm and the other fore limb with its hoof. The printed English names are rubbed out of the picture and replaced by Latin labels that show the translation on hover. Toggleable names on the diagram, names on hover and click-to-answer rounds.
• The horse's intestines and the anterior mesenteric artery — A horse on its back with the abdomen opened, on a 1922 lithograph (McFadyean after Chauveau, Plate XLI): twenty-three structures in Latin – the four parts of the large colon with the pelvic, sternal and diaphragmatic flexures, the caecum, the duodenum, the jejunum and the ileum with the great mesentery, the abdominal aorta and the anterior mesenteric artery with the ileocolic artery, both colic arteries, the artery of the arch, the caecal artery, the ileal branch, the middle colic artery and the fan of jejunal arteries. The printed English names are rubbed out of the picture and replaced by Latin labels that show the translation on hover. Toggleable names on the diagram, names on hover and click-to-answer rounds.
• The horse's trunk and hindquarters — The left side of the horse's trunk and hindquarters with the skin off, on an 1857 steel engraving (Dadd, Fig. 3): fifty-one structures in Latin – the tail with its levator and the coccygeus, the gluteals, the biceps femoris and semitendinosus, the tensor fasciae latae, the rectus femoris and vastus lateralis, the patella and the tibia, the gastrocnemius and the digital flexors and extensors of the gaskin, the bared ribs with the intercostals and the levatores costarum, the oblique and rectus abdominal muscles with the spur vein, the serratus and the latissimus, the nuchal ligament, the rhomboid, splenius, trapezius and brachiocephalic muscles, the muscles of the shoulder blade and the arm with the olecranon, the pectorals and the extensors and flexors of the forearm. The engraver's letters stay; the Latin labels show the translation on hover. Toggleable names on the diagram, names on hover and click-to-answer rounds.
• The horse's leg (gaskin), outer aspect — The horse's left hind limb from the outer side, on a 1922 lithograph (McFadyean, Plate XVIII), from the severed thigh down to the hoof: thirty-two structures in Latin – the rectus femoris and the vastus lateralis with the fascia lata and the bared femur, the patellar ligaments and the collateral ligament of the stifle, the outer head of the gastrocnemius with the soleus and the tendo Achillis, the deep digital flexor and the tendon of the superficial one, the long, lateral and short digital extensors with the peroneus tertius and the annular bands of the hock, the sciatic nerve with the tibial and fibular nerves and the cutaneous nerves of the leg, and for bearings the hock, the cannon, the digit and the hoof. The printed English names are rubbed out of the picture and replaced by Latin labels that show the translation on hover. Toggleable names on the diagram, names on hover and click-to-answer rounds.
• The horse's metatarsus and digit from the outer side — The horse's left hind limb from the hock to the hoof, seen from the outer side with the skin off, on a 1922 lithograph (McFadyean, Plate XIX): twenty-seven structures in Latin – the cut end of the tibia with the stumps of the long and lateral digital extensors and the anterior tibial artery, the superficial flexor's tendon over the point of the hock with the gastrocnemius tendon, the peroneus tertius, the short digital extensor, the cut annular band of the hock, down the metatarsus the superficial and deep flexor tendons with the satellite artery of the plantar nerve and the metatarsal vein, the suspensory ligament, the button of the splint bone and the great metatarsal artery in the groove of the cannon bone, at the fetlock the lumbricalis, the slip from the suspensory ligament to the extensor, the digital artery and vein with the perpendicular artery, and above the hoof the coronary plexus. The printed English names are rubbed out of the picture and replaced by Latin labels that show the translation on hover. Toggleable names on the diagram, names on hover and click-to-answer rounds.
• The horse's abdominal viscera — A horse on its back with the abdomen opened, on a 1922 lithograph (McFadyean, Plate XLIV): forty-seven structures in Latin – the diaphragm and the three lobes of the liver with the falciform ligament, the stomach with its arteries, the spleen, the pancreas, the duodenum and the portal vein, both kidneys with the adrenals, the vena cava and the aorta with the mesenteric, renal and iliac arteries, the ureters, the lumbar nerves on the transversus, the vessels of the cord to the inguinal ring and, below, the bladder with its ligaments and the cut rectum. The printed English names are rubbed out of the picture and replaced by Latin labels that show the translation on hover. Toggleable names on the diagram, names on hover and click-to-answer rounds.
• The horse's metacarpus and digit from the inner side — The horse's right fore limb from the lower end of the forearm to the hoof, seen from the inner side with the skin off, on a 1922 lithograph (McFadyean, Plate IX): thirty-six structures in Latin – the cut flexors of the metacarpus with the median artery dividing into the large and the small metacarpal arteries, the median nerve with the medial palmar nerve and the branch to the lateral, the palmar branch of the ulnar and their union into the lateral palmar nerve above the pisiform, the tendon of the extensor metacarpi obliquus over the carpus, the large metacarpal artery, the metacarpal vein and the medial palmar nerve on the inner face of the flexor tendons, the suspensory ligament along the back of the cannon bone with the dorsal metacarpal artery on the bare bone, at the fetlock the lumbricalis, the interosseous muscle's tendon, the extensor branch of the suspensory, the three digital nerves with the digital artery and vein and the ligament of the ergot across the vessels, and the hoof. The printed English names are rubbed out of the picture and replaced by Latin labels that show the translation on hover. Toggleable names on the diagram, names on hover and click-to-answer rounds.
• The horse's brain from above — The horse's brain seen from above on a 1902 engraving (McFadyean, Plate XXXIV): fifteen structures in Latin – the great longitudinal fissure between the hemispheres, the crucial, the great oblique (suprasylvian) and the lateral (presylvian) fissures of each hemisphere, the eight convolutions McFadyean lettered on the crowns (the second and third anterior, the antero- and postero-marginal, the first and second oblique, the first and second postero-inferior), the lateral lobes and the vermis of the cerebellum, and the medulla oblongata. The printed English names, their leaders and the letters on the crowns are rubbed out of the picture and replaced by Latin labels that show the translation on hover. Toggleable names on the diagram, names on hover and click-to-answer rounds.

Cow

• Cow's circulatory system — A dairy cow in left profile on a colour lithograph from 1924, arteries in red and veins in blue. Sixty-five structures in Latin: the heart, the ascending and descending aorta, the carotids and the jugulars, the arteries of the head and face and of the neck, the intercostal, bronchial and oesophageal branches, the coeliac trunk with the mesenteric, renal and lumbar arteries, the iliac, femoral and tibial arteries down to the hoof, both venae cavae, the azygos, the hepatic veins and the portal vein. Printed names you can switch off, names on hover, and click rounds.
• Cow skeleton — The cow's skeleton in profile, on Hermann Dittrich's lithograph from Ellenberger and Baum's Handbuch der Anatomie der Tiere für Künstler: fifty-one structures in Latin — on the skull the horn core, the frontal, temporal, nasal, lacrimal and zygomatic bones, the orbit, the maxilla, the incisive bone, the mandible and the teeth; on the spine the atlas, the axis, the cervical, thoracic, lumbar and caudal vertebrae and the sacrum; on the chest the ribs with their cartilages and the three parts of the sternum; on the forelimb the shoulder blade with its cartilage and spine, the humerus with its greater tubercle, deltoid tuberosity and condyle, the olecranon, the ulna and radius, the carpal bones with the accessory carpal, the cannon bone and the phalanges; on the hind limb the ilium with both its tubers, the ischium, the femur with its greater trochanter, the patella, the tibia, the remnant of the fibula, the malleolar and calcaneal bones, the tarsal bones, the cannon bone and the phalanges. Ten of them are drawn on both limbs and light up together. Toggleable names on the diagram, names on hover and clickable rounds.
• Cow's internal organs — A cow in profile with its body wall opened and the rumen removed and drawn separately beside it, in a colour lithograph from 1905: thirty-three structures in Latin – nineteen the author numbered himself (the brain, the cerebellum, the spine and the ribs, the nostrils, the lower jaw, the tongue, the windpipe, the gullet, the heart, the lungs, the liver, the stomach, the large intestine, the small intestine, the mesentery, the bladder, the left kidney, the rectum and the vagina), and fourteen more the plate draws but does not name: the rumen, the skull, the teeth, the horns, the ears, the udder, the breastbone, the tail, the hooves, the nasal cavity, the spleen, the uterus, the muscles and the skin. Printed names you can switch off, names on hover, and click rounds.
• The cow's muscles — A cow in profile with the skin removed, in Hermann Dittrich's 1889 lithograph for Ellenberger and Baum's atlas for artists: forty-one structures in Latin – twenty-five muscles from the masseter, the brachiocephalic, sternomandibular and omotransverse muscles through the trapezius, the deltoid and both heads of the triceps, both pectorals, the serrate muscles, the latissimus dorsi and the abdominal obliques to the tensor fasciae latae, the middle gluteal, the biceps femoris, the semitendinosus and three muscles of the tail; three fasciae; eleven bony points from the wing of the atlas, the spine of the scapula and the acromion to the hook bone, the pin bone, the greater trochanter and the patella; three subcutaneous veins; and the udder. The author's own letters and numbers stay on the plate. Names in the diagram and names on hover can be switched on or off, and the rounds are answered by clicking.

Turtle

• Turtle anatomy — A turtle in two views on a Wikimedia Commons diagram: from above the carapace with its nuchal, vertebral, costal, marginal and supracaudal scutes, the head with its eyes, the front and hind paws with their claws and the tail; from below, with the plastron removed, the organs – oesophagus and trachea, lungs, heart, stomach, liver, intestine, urinary bladder, rectum, cloaca and anus. Twenty-three structures in Latin; the numbers of the original diagram are replaced by Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.

Spider

• Spider anatomy — The internal anatomy of a female spider in profile, on Ryan Wilson's diagram after Comstock's The Spider Book (Wikimedia Commons): 27 structures in Latin – the prosoma and the opisthosoma, the simple eyes, the brain, the chelicera with its venom gland, venom canal and fang, the pedipalp and the coxae of the legs, the oesophagus, the sucking stomach, the digestive caeca, the intestine, the digestive tubules, the stercoral pocket and the anus, the heart with its pericardium and the aorta, the book lung, the Malpighian tubules, the ovary, the oviduct and the sperm receptacle, the silk glands and the spinnerets. The Latin chips translate on hover. Toggleable names in the diagram, names on hover, and clickable rounds.

Insect

• Insect anatomy — A generalised insect in profile on Piotr Jaworski's Wikimedia Commons diagram: thirty-six structures in Latin – head, thorax and abdomen, the antenna, the compound eye and both ocelli, the brain, the suboesophageal and thoracic ganglia and the ventral nerve cord, the mouthparts and the salivary gland, the fore-, mid- and hindgut with the anus, the dorsal vessel and the heart, the tracheae, the Malpighian tubules, the ovary, oviduct and vagina, both wings, the three segments of the thorax and all six segments of the leg from the coxa to the claws. The numbers of the original diagram are replaced by Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.
• Bee anatomy — A schematic of a worker honey bee's organs after Walké's Wikimedia Commons plate with the wikigraphists: fifty-five structures in Latin – the tongue, the maxilla, the mandible, the upper and lower lip, the glands of the head (hypopharyngeal, mandibular, labial and postcerebral), the pharynx and oesophagus, the brain and an ocellus, the flight muscles, the salivary glands, the thoracic ganglia, the aorta with its loops, both wings, the heart with its ostia, the spiracles, the air sac, the crop, the proventriculus, the midgut and the small intestine, the Malpighian tubules, the rectum with its rectal pads and the anus, the Nasonov and wax glands, the ventral nerve cord, the spermatheca, the venom gland with its sac, the sting sheath and canal, and the hind leg from the coxa over the pollen basket to the claws. The numbers of the original diagram are replaced by Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.
• Mosquito anatomy — The external anatomy of a female house mosquito (Culex pipiens) after Mariana Ruiz Villarreal's (LadyofHats) Wikimedia Commons plate: thirty-two structures in Latin – the head with the proboscis, the antennae and their flagellomeres, the maxillary palps, the compound eyes and the occiput; the thorax with the antepronotum, the scutum, the scutellum, the postnotum and the halteres; the abdomen with its seven segments and the cerci; the fore, mid and hind legs, on the foreleg the femur, the tibia and the tarsomeres; and the wing with its six longitudinal veins (costa, subcosta, radius, media, cubitus, anal) and three crossveins. The English labels of the original diagram are replaced by Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.
• House fly anatomy — The external anatomy of the house fly (Musca domestica) after Al2's Wikimedia Commons plate: thirty-six structures in Latin – the head with the compound eye, the antenna and the arista, the maxillary palps and the proboscis (rostrum, haustellum, labella); the thorax with the prescutum, the scutum and the scutellum, three pleura and three sterna, the anterior and posterior spiracles, the calypters and the haltere; the wing with its veins and the basicosta; the abdomen with its segments; the fore, mid and hind legs, on the hind leg the coxa, the femur, the tibia with its spur and the tarsus. The numbers of the original diagram are replaced by Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.

Fish

• Internal organs of a fish — A bony fish in profile on the Sharon High School diagram from Wikimedia Commons: twenty-eight structures in Latin – the mouth, the pharynx, the gills, the oesophagus, the stomach, the pyloric caeca, the intestine, the liver, the pancreas, the spleen and the anus, the heart and the dorsal aorta, the brain, the olfactory bulb and the spinal cord, the kidney, the ureter, the urinary bladder and the urogenital opening, the swim bladder, the ovary and the oviduct, the eye and four fins. The English labels of the original diagram are replaced by Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.
• External anatomy of a fish — A bony fish (Hector's lanternfish) in profile after Przemysław Kubiak's Wikimedia Commons plate: fifteen structures in Latin – the operculum, the lateral line, the dorsal, adipose, caudal, anal, pelvic and pectoral fins, the caudal peduncle, the photophores, the eye, the mouth, the scales, the head and the trunk. The plate's numbers are replaced by Latin chips that show a translation on hover. Toggleable names on the diagram, names on hover, and click-to-answer rounds.
• Reproductive organs of a fish — A male bony fish in profile after Uwe Gille's Wikimedia Commons plate: seventeen structures in Latin – the testis and the sperm duct among the other viscera, the liver, the stomach, the intestine, the heart, the swim bladder, the kidney, the ureter and the urinary bladder, plus the gills, the eye, the mouth and four fins. The plate's numbers are replaced by Latin chips that show a translation on hover. Toggleable names on the diagram, names on hover, and click-to-answer rounds.
• Heart of a fish — A fish's two-chambered heart in section, after Ahnode's scheme on Wikimedia Commons: ten structures in Latin – the ventral aorta, the bulbus arteriosus, the ventricle with its spongy myocardium and trabeculae, the atrium, the sinus venosus with its vein openings and afferent veins, and the direction of blood flow. The original carries no labels; the Latin chips show a translation on hover. Toggleable names on the diagram, names on hover and click-to-answer rounds.

Mouse

• Mouse anatomy — A laboratory mouse on its back after Cjl d's Wikimedia Commons plate (Portal et al., Scientific Reports 2017): twenty-six structures in Latin – the larynx, the trachea with its cartilages, both bronchi, the four lobes of the right lung and the left lung, the oesophagus and the stomach, the thyroid, the uterine horns, the cervix, the vagina, the vulva, the anus and the tail, plus the auricle and the ear canal, the eye, the whiskers, the nose and the paws. The Latin chips show a translation on hover. Toggleable names on the diagram, names on hover, and click-to-answer rounds.

Bird

• Bird skeleton — A stylised dove skeleton from Wikimedia Commons (BIODIDAC, vectorised by mario modesto): thirty bones in Latin – the skull, the cervical, thoracic and caudal vertebrae, the synsacrum and the pygostyle, the wishbone, the coracoid and the scapula, the humerus, the ulna and the radius, the carpal bones, the carpometacarpus and the three digits of the wing, the ribs with their uncinate processes, the body and the keel of the sternum, the ilium, the ischium and the pubis, the femur, the patella, the tibiotarsus, the fibula, the tarsometatarsus and the toes. The Latin chips show a translation on hover. Toggleable names on the diagram, names on hover, and click-to-answer rounds.
• Bird underwing — A drawing of a bird's spread wing from below, from Wikimedia Commons (L. Shyamal): ten feather tracts in Latin – the primaries and the secondaries, the marginal, lesser, median and greater coverts, the lesser and greater primary coverts, the axillaries and the carpal joint. The Latin chips show a translation on hover. Toggleable names on the diagram, names on hover, and click-to-answer rounds.
• Bird wing feathers — A coloured sketch of a bird's spread wing from above, from Wikimedia Commons (Erfil after Muriel Gottrop): nine feather tracts in Latin – the primaries, secondaries and tertials, the alula, the greater primary coverts, the greater, median and lesser coverts, and the scapulars. The Latin chips show a translation on hover. Toggleable names on the diagram, names on hover, and click-to-answer rounds.
• Bird wing skeleton — A drawing of a passerine's spread wing skeleton inside the wing's outline, from Wikimedia Commons (Retired electrician): the humerus, radius and ulna, the carpal bones, the carpometacarpus, the alular digit, both phalanges of the major digit, the minor digit, the hand as a whole and the wing's outline – eleven Latin chips that show a translation on hover. Toggleable names on the diagram, names on hover, and click-to-answer rounds.
• Adaptations of bird beaks — Sixteen bird heads from Wikimedia Commons (L. Shyamal), each with a beak shaped for a different way of feeding: generalist, insect catching, grain eating, coniferous-seed eating, nectar feeding, fruit eating, chiseling, dip netting, surface skimming, scything, probing, filter feeding, aerial and pursuit fishing, scavenging and raptorial – sixteen Latin chips that show a translation on hover. Toggleable names on the diagram, names on hover, and click-to-answer rounds.
• Bird brain and the song system — A diagram of a songbird's brain from Wikimedia Commons (L. Shyamal after F. Nottebohm): the telencephalon, diencephalon, midbrain, cerebellum, medulla and olfactory bulb, the six nuclei of the song system (HVC, RA, LMAN, Area X, DLM, nXIIts), the posterior descending and anterior forebrain pathways and the hypoglossal branch to the syrinx – fifteen Latin chips that show a translation on hover. Toggleable names on the diagram, names on hover, and click-to-answer rounds.
• Anatomy of an amniotic egg — A section through a bird's (amniotic) egg after Horst Frank's drawing on Wikimedia Commons: fourteen structures in Latin – the cuticle, the shell, the outer and inner shell membranes, the air cell, the outer thin, thick and inner thin albumen, the chalazae, the vitelline membrane, the yellow and white yolk, the nucleus of Pander and the germinal disc. Latin labels show a translation on hover. Toggleable names on the diagram, names on hover and clickable rounds.
• Bird atlas — Birds of the world and of your country: photos, what they eat, where they live, which fly away every year and which are awake at night, record-breaking birds and fun facts for children. Practice and a challenge with photos.

Snake

• Snake anatomy — A schematic of a snake's internal organs after Uwe Gille's Wikimedia Commons plate: sixteen structures in Latin – the oesophagus, the trachea, the tracheal lung, the rudimentary left lung, the right lung and its air sac, the heart, the liver, the stomach, the gallbladder, the pancreas, the spleen, the intestine, the testes, the kidneys and the cloaca. Hover a Latin label to see its translation. Toggle names on the diagram, names on hover, and click-to-answer rounds.

Dinosaurs

• Tyrannosaurus and Triceratops — Tyrannosaurus rex and Triceratops horridus from Hell Creek, 68–66 million years ago, to scale beside a human, in Bonobo Brain's own drawing. A switch shows their skeletons instead of the living animals: 89 parts from the head, teeth and horns to the femur, vertebrae, chevrons and hooves. Hovering shows an explanation – a simple one a child can follow and a deeper one for the curious. Toggleable names on the picture, names on hover and clickable rounds.
• Dinosaurs of Hell Creek — 25 dinosaur species from the Hell Creek Formation and a human, to the same scale, after a comparison chart on Wikimedia Commons. Hovering over an animal brings all of it to the front, legs and tail included, even where they are hidden behind the others. Switches show coloured silhouettes or skeletons. For each species, an explanation for children and for the curious, what its name means, its size and its diet.

Plants

Plant structure

• Plant cell structure — The structure of a plant cell after Mariana Ruiz's (LadyofHats) Wikimedia Commons diagram: twenty-two structures in Latin – the cell wall with its plasmodesmata, the plasma membrane, the cytoplasm with the cytoskeleton, the chloroplast with its thylakoid membrane and starch grains, the vacuole with its tonoplast, the mitochondria, the peroxisomes, the small membranous vesicles, the nucleus with its nuclear envelope, nuclear pores and nucleolus, the rough and the smooth endoplasmic reticulum, the ribosomes and the Golgi apparatus with its vesicles. The English labels of the original diagram are replaced by Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.
• Flower structure — The structure of a flower after Mariana Ruiz's (LadyofHats) Wikimedia Commons diagram: seventeen structures in Latin – the pistil with its stigma, style and ovary with the ovules, the stamen with its anther (connective, pollen sacs, pollen grains) and filament, the perianth with the petals and sepals, the nectary, the receptacle and the pedicel. The English labels of the original diagram are replaced by Latin labels that show a translation on hover; hovering the pistil, the stamen or the perianth lights up all of its parts. Toggleable names in the diagram, names on hover and clickable rounds.
• Leaf tissue structure — A cut through a leaf from Zephyris's drawing on Wikimedia Commons: the cuticle, the upper epidermis, the mesophyll with its palisade and spongy parenchyma, the lower epidermis and a stoma between two guard cells – and inside the cells the chloroplasts, vacuoles, nuclei, cell walls and cytoplasm. Pointing at a chloroplast lights every chloroplast in the leaf, pointing at a tissue its whole layer. The English labels of the original diagram are replaced by Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.
• Leaf structure — A 3D cutout of a leaf blade from Zephyris's drawing on Wikimedia Commons: the cuticle, the upper and lower epidermis, the palisade and spongy mesophyll, a row of stomata between their guard cells, two trichomes on the upper side and a vascular bundle with its bundle sheath, xylem and phloem. The name of the vascular bundle lights its sheath, xylem and phloem together. The English labels of the original diagram are replaced by Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.

Leaf morphology

• Leaf shape and arrangement — The shapes of leaves after the Leaf morphology chart on Wikimedia Commons (Debivort, McSush): forty drawings named in Latin, in three groups – the shape of the blade (forma laminae), from the acicular, lanceolate and ovate to the cordate, sagittate and peltate leaf; compound leaves (folium compositum), from the odd- and even-pinnate to the tripinnate, the trifoliate and the digitate leaf; and how leaves stand on the stem (dispositio foliorum) – alternate, opposite, whorled and in a rosette. The English labels of the original chart are replaced by Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.
• Leaf margin — Twelve kinds of leaf margin (margo) after the Leaf morphology chart on Wikimedia Commons (Debivort, McSush): entire, serrate, serrulate, doubly serrate, dentate, denticulate, crenate, lobate, sinuate, undulate, ciliate and spiny, with Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.
• Leaf venation — Nine kinds of venation (nervatio) after the Leaf morphology chart on Wikimedia Commons (Debivort, McSush): pinnate, palmate, parallel, longitudinal, arcuate, dichotomous, reticulate, rotate and cross-venulate, with Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.

Photosynthesis

• Photosynthesis — Photosynthesis after the Wikimedia Commons diagram by At09kg, Wattcle and Nefronus: a sunflower in soil under the sun and ten terms in Latin – sunlight, the carbon dioxide (CO₂) the leaf takes from the air, the water (H₂O) the roots take from the soil, the oxygen (O₂) the leaf gives off and the sugars made in the leaf, plus the leaf, the stem, the root, the flower and the plant as a whole. The English labels of the original are replaced by Latin tags that show a translation on hover; the chemical formulas stay. Toggleable names on the diagram, names on hover and click rounds.
• Autotrophs and heterotrophs — The cycle between autotrophs and heterotrophs in Mikael Häggström's picture from Wikimedia Commons: plants, algae and bacteria use light, water and carbon dioxide to make organic compounds and oxygen by photosynthesis; animals, fungi and the plants themselves turn them back by cellular respiration. Nine terms in Latin – hover for the translation and an explanation, a simple one a child can follow and a deeper one for the curious. The sun is added to the original. Toggleable names in the diagram, names on hover and clickable rounds.
• Photosynthesis overview — Photosynthesis after Daniel Mayer's (mav) Wikimedia Commons diagram, vectorised by Yerpo: the light, the light reactions and the Calvin cycle in the chloroplast, the water and carbon dioxide that go in, the oxygen and sugar that come out, and between the two stages ATP, NADPH, NADP⁺ and ADP + Pᵢ – twelve terms in Latin, with the molecule abbreviations kept as they are. The English labels of the original are replaced by Latin tags; hovering shows a translation and an explanation – a simple one a child can follow, and a deeper one for the curious. Toggleable names on the diagram, names on hover and click rounds.
• Chloroplast — The structure of a chloroplast after SuperManu's (Emmanuel Boutet) Wikimedia Commons scheme: twelve structures in Latin and the envelope as a whole – the outer membrane, the intermembrane space and the inner membrane, the stroma, the thylakoids with their membrane and lumen, the grana and the stroma lamellae, starch grains, ribosomes, plastid DNA and plastoglobules. The numbers of the original scheme are replaced by Latin labels that show a translation on hover. Toggleable names in the diagram, names on hover and clickable rounds.
• Calvin cycle — The Calvin cycle after Mike Jones's diagram on Wikimedia Commons: how a plant builds sugar from the carbon dioxide in the air with energy from ATP and NADPH. Sixteen parts in Latin – the three phases of the cycle (carbon fixation, reduction and regeneration of RuBP), the enzyme RuBisCO, carbon dioxide, ribulose 1,5-bisphosphate, 3-phosphoglycerate, 1,3-bisphosphoglycerate, glyceraldehyde 3-phosphate, ribulose 5-phosphate, inorganic phosphate, ATP, ADP, NADPH, NADP⁺ and the way out to the cell's metabolism. The molecules are drawn as balls of atoms and each lights up whole; the Latin labels show a translation and a simple explanation on hover, and a key under the diagram explains the atom colours. Toggleable names on the diagram, names on hover and clickable rounds.
• Thylakoid membrane — The light reactions of photosynthesis in the thylakoid membrane, after the Wikimedia Commons diagram by Yikrazuul (with RobKohl's cyclic route): fourteen terms in Latin – the stroma, the thylakoid lumen and the membrane between them, photosystems II and I, the cytochrome b₆f complex, the carriers plastoquinone, plastocyanin and ferredoxin, the ferredoxin–NADP⁺ reductase, the ATP synthase, the photolysis of water, light and the cyclic electron transport. The German labels of the original are replaced by Latin tags that show a translation on hover; the formulas and abbreviations stay. Toggleable names on the diagram, names on hover and click rounds.

Plant systematics

• Plant systematics — A simplified family tree of the land plants, an original Bonobo Brain drawing: ten groups in Latin – the green algae as the outgroup, liverworts, hornworts and mosses, clubmosses, ferns with horsetails, gymnosperms and flowering plants with the monocots and eudicots – and four nodes with the key innovations: embryo and cuticle, vascular bundles, seed, flower and fruit.
• Monocots vs dicots — Flowerpower207's Wikimedia Commons chart comparing monocots and dicots: one and two cotyledons, parallel and net veins, scattered vascular bundles and bundles in a ring, flower parts in threes and in fours or fives – ten terms in Latin. The English labels of the original are replaced by Latin tags; hovering shows a translation and an explanation – a simple one a child can follow, and a deeper one for the curious. Toggleable names on the diagram, names on hover and click rounds.

Reproduction and life cycles

• Life cycle of a fern — The alternation of generations in a fern after Jeffrey Finkelstein's diagram (revised by Chiswick Chap) on Wikimedia Commons: the diploid sporophyte with its fronds, rhizome, sori and a sporangium, meiosis and the spores, the haploid prothallus with its rhizoids, antheridia and archegonia, mitosis, sperm cells and egg cells, fertilisation, the zygote and the young sporophyte – nineteen terms in Latin. The English labels of the original are replaced by Latin labels that show a translation on hover; a structure drawn at more than one step of the cycle lights up everywhere at once. Toggleable names in the diagram, names on hover and clickable rounds.
• Life cycle of a moss — The life cycle of a haircap moss after the Wikimedia Commons diagram by Tomáš Kebert and umimeto.org: the sporophyte with its seta and capsule, the spores and their germination into a protonema, the male and female gametophytes with their antheridia and archegonia, and fertilisation – ten terms in Latin. The step numbers of the original are replaced by Latin labels that show a translation on hover; a structure drawn at more than one step of the cycle lights up everywhere at once. Toggleable names in the diagram, names on hover and clickable rounds.
• Life cycle of a flowering plant — The life cycle of a flowering plant after Mariana Ruiz's (LadyofHats) Wikimedia Commons diagram: the mature sporophyte and its flower with the perianth, the stamens and the pistil, the ovule from the megaspore mother cell through meiosis and the megaspores to the embryo sac with its egg cell, synergids, antipodal cells and polar nuclei, the anther from the microspore mother cell through the microspores to the pollen grain with its vegetative and generative cells, pollination and double fertilisation with the pollen tube and the sperm cells, the seed with its coat, endosperm and embryo, and the seedling – forty-one terms in Latin. The English labels of the original are replaced by Latin labels that show a translation on hover; a structure drawn at more than one step of the cycle lights up everywhere at once. Toggleable names in the diagram, names on hover and clickable rounds.

Herbs

• Introduction to Chinese medicine — For children and adults: what traditional Chinese medicine is, qi, yin and yang, the five flavours plus bland and astringent, the temperature nature of herbs and the meridians – explained as concepts of the tradition, not as scientific facts, with a reminder that herbs can be poisonous.
• Chinese herbs — An atlas of the medicinals of traditional Chinese medicine by the chapters of the 中药学 textbook: characters, pinyin, Latin name, plant part, traditional nature, flavours and meridians, notes on safety and species protection. Filters and search, practice and a challenge.
• European herbs — Medicinal herbs of the European tradition, following the European Pharmacopoeia and the monographs of the European Medicines Agency. Coming soon.
• Ayurveda and the world — Herbs of Ayurveda and other traditions of the world. Coming soon.

Fungi

Mushrooms of the world

• Mushrooms – the basics — What a fungus is, the parts of a mushroom, what is under the cap, how fungi live, which poisonings they cause and the rules of safe picking.
• Mushroom atlas — Mushrooms known across the world, sorted by country: edible and poisonous ones, their look-alikes, features with icons, when and where they grow. Practice and challenge with photos.

Chemistry

Periodic table

• Periodic table of the elements — All 118 elements, coloured by group. Point at a square to see its name, click to learn more. In the quiz you find elements by name.
• Groups of elements — Alkali metals, halogens, noble gases… Ten groups of elements, where we meet them, and a quiz that has you recognise them without the colours.
• Elements around us — Fourteen elements you meet every day – in the air, in water, in the kitchen and in your phone. A short explanation for each, and riddles.
• Why is iron Fe? — Element symbols from Latin – ferrum, aurum, argentum, plumbum – what they mean and the stories behind them.

Weather

Clouds

• The ten cloud genera — The ten cloud genera of the World Meteorological Organization's (WMO) International Cloud Atlas, after Valentin de Bruyn's (Coton) picture on Wikimedia Commons: cirrus, cirrocumulus, cirrostratus, altocumulus, altostratus, nimbostratus, stratocumulus, stratus, cumulus and cumulonimbus on three levels of the sky. The original's English labels are replaced by the Latin names and their abbreviations; hovering shows the name in your language and an explanation – a simple one a child can follow, and a deeper one for the curious. Toggleable names on the diagram, names on hover and clickable rounds.

Storms

• The structure of a supercell — A supercell – the strongest kind of thunderstorm, with a rotating updraft – after Kelvinsong's diagram on Wikimedia Commons (CC BY-SA 3.0, modified): the anvil with its overshooting top, the updraft and the downdrafts, the flanking line, the wall cloud and tornado, the shelf cloud, virga, hail and rain. The names are in Latin after the WMO International Cloud Atlas where the term exists, otherwise in meteorologists' technical terms; hovering shows the translation and an explanation – a simple one a child can follow, and a deeper one for the curious. Toggleable names on the diagram, names on hover and clickable rounds.

The water cycle

• The water cycle — The water cycle on the “Water cycle diagram” from Wikimedia Commons: evaporation, water given off by plants, cloud formation, precipitation, melting snow, water running down slopes, infiltration and groundwater flow between the sea, the air, the land and the ground beneath it. The labels on the diagram show the technical terms (evaporation, condensation, precipitation, infiltration); hovering shows an everyday name in your language and an explanation – a simple one a child can follow, and a deeper one for the curious. Toggleable names on the diagram, names on hover and clickable rounds.

Space

The Solar System

• Bodies of the Solar System — The Sun, the eight planets, the dwarf planets, the largest bodies of the asteroid belt and the largest moons, after Beinahegut's chart on Wikimedia Commons (CC BY-SA 4.0, modified) – the sizes are to scale, the distances are not. The English labels of the original are replaced by Latin labels that show the English name on hover. Small moons and asteroids have a larger area around them to point at and click. Toggleable names in the diagram, names on hover and clickable rounds. Hovering over a body also shows facts about it: what it is made of, its atmosphere, how long sunlight takes to reach it and how long spacecraft took to get there.
• Why do stars fall? — Why do stars fall – in Bonobo Brain's own drawing: a pebble's journey from space to the ground in five steps (meteoroid, meteor, bolide, dark flight and meteorite), the five colours of meteors with the elements' symbols and why each element glows the way it does, and around them an asteroid, a comet, the Moon, the ISS space station, the edge of space, an aeroplane, cosmic dust, the Ondřejov observatory, people watching meteors, the Hoba meteorite and the end of the dinosaurs. Every ten seconds or so the fall replays as an animation. Hovering shows an explanation – a simple one a child can follow and a deeper one for the curious – and fun facts. Toggleable names in the picture, names on hover and clickable rounds.

Black holes

• Black hole — A black hole outside and up close, in Bonobo Brain's own drawing: sixteen parts – the shadow, the photon ring, the accretion disc and its far side bent by gravity, the jets, a companion star with its gas stream, a gravitational lens and an astronaut being spaghettified, and in a magnified view from above the singularity, the event horizon, the Schwarzschild radius, the ergosphere, the photon sphere, the innermost stable circular orbit (ISCO) and Hawking radiation. Hovering shows an explanation – a simple one a child can follow and a deeper one for the curious – and a fun fact, for some parts also how gravity slows time. Toggleable names on the diagram, names on hover and clickable rounds.

Scales of the universe

• The size of the universe — From a neutron star the size of a city through planets, the Sun and giant stars to black holes, galaxies and the whole observable universe – 46 bodies side by side at their true relative sizes. Zoom out and in with the wheel, the slider or your finger, start the tour and hover over a body: you will see how big it is and how far away, how long light takes to cross it or a car to drive across it, what it is made of, explanations for kids and for the curious, and a fun fact.

Constellations

• The northern sky — An interactive map of the 42 constellations of the northern celestial hemisphere – from Ursa Major and Cassiopeia around Polaris to Orion on the celestial equator. Hover over a constellation and the panel shows what its name means, its brightest star and that star’s distance, the constellation’s size, when and where it can be seen, and a fun fact.
• The southern sky — An interactive map of the 58 constellations of the southern celestial hemisphere – from the Southern Cross and Centaurus to Orion on the celestial equator. Hover over a constellation and the panel shows what its name means, its brightest star and that star’s distance, the constellation’s size, when and where it can be seen, and a fun fact.

Storm Modes

• Nature Storm — Animals, plants, ecosystems and natural records. 2 minutes, tricky options.
• Guess the Flag — Guess countries by their flag. 2 minutes, tricky options.
• Guess the Country — Guess countries by their silhouette on the map. 2 minutes, tricky options.
• Guess the Capital — Guess the capital city of a country. 2 minutes, tricky options.
• History Storm — World history questions. 2 minutes, tricky options.
• Pharmacology Storm — Test your pharmacology knowledge. 2 minutes, tricky questions.
• Political Science Storm — Political systems, ideologies, international relations. 2 minutes, tricky questions.
• Anatomy Storm — Bones, muscles, organs — test your anatomy knowledge. 2 minutes, tricky options.
• Chinese Herbs Storm — Quick questions on the medicinals of Chinese medicine – characters, pinyin, Latin, chapters, nature, flavours and meridians. 2 minutes, tricky options.
• European Herbs Storm — Quick questions on European herbal substances from the EMA monographs – names, Latin, source plants, areas of use and indications. 2 minutes, tricky options. For learning, not for treatment.
• Mushrooms Storm — Quick questions about mushrooms – Latin names, poisonous species, types of poisoning and look-alikes. For learning, not for identifying mushrooms to eat.
• Birds Storm — Quick questions about birds – Latin names, which cannot fly, which are awake at night, which fly away every year, what they eat and which group they belong to.
• Mix Storm — Questions from all categories at once. Flags, maps, history and more.

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