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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
A fixed action pattern elicited by a sign stimulus.
Assessing for Bulge Sign, Milking the Patella
Signs of hypocalcemia and hypoparathyroidism; A, Chvostek's sign; B, Trousseau's sign.
This 19-year-old in Wisconsin was given a reduced jail sentence for holding this sign in front of ...
Sign on methanol pump shows that methyl alcohol is a poison and can cause skin irritation and other ...
Retroauricular Ecchymosis (Battle's Sign)