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There are more sensory neurons in the tongue than in any other part of the body.
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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").