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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The Centers for Disease Control and Prevention (CDC) was originally known as the Communicable Disease Center, which was formed to fight malaria. It was originally headquartered in Atlanta, Georgia, since the Southern states faced the worst threat from malaria.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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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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The horizontal fraction bar was introduced by the Arabs.