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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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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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There are 60,000 miles of blood vessels in every adult human.