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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.