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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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.
More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.