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The longest a person has survived after a heart transplant is 24 years.
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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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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.