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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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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.