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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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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").

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The horizontal fraction bar was introduced by the Arabs.

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