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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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Your heart beats over 36 million times a year.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.