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There are 20 feet of blood vessels in each square inch of human skin.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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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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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.