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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.