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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 modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.