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Did you know?
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 average office desk has 400 times more bacteria on it than a toilet.
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There are 20 feet of blood vessels in each square inch of human skin.
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The horizontal fraction bar was introduced by the Arabs.
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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.