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The horizontal fraction bar was introduced by the Arabs.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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There are 60,000 miles of blood vessels in every adult human.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.