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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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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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Addicts to opiates often avoid treatment because they are afraid of withdrawal. Though unpleasant, with proper management, withdrawal is rarely fatal and passes relatively quickly.