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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The average office desk has 400 times more bacteria on it than a toilet.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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Cyanide works by making the human body unable to use oxygen.