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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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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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The average office desk has 400 times more bacteria on it than a toilet.
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There are 20 feet of blood vessels in each square inch of human skin.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.