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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.