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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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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.