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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 horizontal fraction bar was introduced by the Arabs.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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One way to reduce acid reflux is to lose two or three pounds. Most people lose weight in the belly area first when they increase exercise, meaning that heartburn can be reduced quickly by this method.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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