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On average, the stomach produces 2 L of hydrochloric acid per day.
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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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.