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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.