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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The familiar sounds of your heart are made by the heart's valves as they open and close.