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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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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.