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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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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 first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.