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There are 60,000 miles of blood vessels in every adult human.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The average adult has about 21 square feet of skin.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.