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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Your heart beats over 36 million times a year.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.