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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
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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 familiar sounds of your heart are made by the heart's valves as they open and close.