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Did you know?
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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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 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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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The horizontal fraction bar was introduced by the Arabs.