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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.
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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 familiar sounds of your heart are made by the heart's valves as they open and close.
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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.