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Asthma cases in Americans are about 75% higher today than they were in 1980.
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There are 20 feet of blood vessels in each square inch of human skin.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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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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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."