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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Your heart beats over 36 million times a year.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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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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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.