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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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.
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The average office desk has 400 times more bacteria on it than a toilet.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.