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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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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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Cyanide works by making the human body unable to use oxygen.
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Less than one of every three adults with high LDL cholesterol has the condition under control. Only 48.1% with the condition are being treated for it.