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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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.