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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.

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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

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On average, the stomach produces 2 L of hydrochloric acid per day.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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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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