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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 average adult has about 21 square feet of skin.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.