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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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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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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.