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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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There are more sensory neurons in the tongue than in any other part of the body.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.