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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 most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
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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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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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The familiar sounds of your heart are made by the heart's valves as they open and close.