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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The average office desk has 400 times more bacteria on it than a toilet.
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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.