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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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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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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.