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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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Cyanide works by making the human body unable to use oxygen.
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There are more bacteria in your mouth than there are people in the world.
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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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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.