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There are 20 feet of blood vessels in each square inch of human skin.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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The horizontal fraction bar was introduced by the Arabs.