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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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Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.

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The average adult has about 21 square feet of skin.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

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The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.

Freedom House is a nonprofit institution that uses several different factors to rank countries based Freedom House is a nonprofit institution that uses several different factors to rank countries based
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