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Did you know?
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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There are 20 feet of blood vessels in each square inch of human skin.
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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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The largest baby ever born weighed more than 23 pounds but died just 11 hours after his birth in 1879. The largest surviving baby was born in October 2009 in Sumatra, Indonesia, and weighed an astounding 19.2 pounds at birth.
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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.