Did you know?

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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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