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Did you know?
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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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.