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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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The average office desk has 400 times more bacteria on it than a toilet.
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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.
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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.