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The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.

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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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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 Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

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