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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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Your heart beats over 36 million times a year.