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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.