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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 Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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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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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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