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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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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The average office desk has 400 times more bacteria on it than a toilet.
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Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.