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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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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
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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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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.