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Did you know?
The average office desk has 400 times more bacteria on it than a toilet.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
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The horizontal fraction bar was introduced by the Arabs.
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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.