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There are 20 feet of blood vessels in each square inch of human skin.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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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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The longest a person has survived after a heart transplant is 24 years.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.