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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

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The horizontal fraction bar was introduced by the Arabs.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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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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