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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 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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Medication errors are more common among seriously ill patients than with those with minor conditions.
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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.