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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.