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The horizontal fraction bar was introduced by the Arabs.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The familiar sounds of your heart are made by the heart's valves as they open and close.