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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.