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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.