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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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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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On average, the stomach produces 2 L of hydrochloric acid per day.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.