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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.
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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.