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Did you know?
Your heart beats over 36 million times a year.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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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.
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The average office desk has 400 times more bacteria on it than a toilet.