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There are more sensory neurons in the tongue than in any other part of the body.

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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.

The degree of cerebral cortex folding in different mammalian species. The brains are not shown to sc The degree of cerebral cortex folding in different mammalian species. The brains are not shown to sc
These species are all at risk of extinction. Species with “slow” life-h These species are all at risk of extinction. Species with “slow” life-h
Blue-tongued lizards are the largest species of skink Blue-tongued lizards are the largest species of skink
Structures of the Human Eye Structures of the Human Eye
Vestibular apparatus inside a human ear Vestibular apparatus inside a human ear
Sources of Variation in Traits Among Individuals of a Species Sources of Variation in Traits Among Individuals of a Species
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