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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.