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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.