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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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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Carbamazepine can interfere with the results of home pregnancy tests. If you are taking carbamazepine, do not try to test for pregnancy at home.
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There are more bacteria in your mouth than there are people in the world.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.