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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Illicit drug use costs the United States approximately $181 billion every 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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There are more nerve cells in one human brain than there are stars in the Milky Way.