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There are 20 feet of blood vessels in each square inch of human skin.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Your heart beats over 36 million times a year.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.