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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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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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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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