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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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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 human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.