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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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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On average, the stomach produces 2 L of hydrochloric acid per day.