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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.