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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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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.