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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.