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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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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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Medication errors are more common among seriously ill patients than with those with minor conditions.
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According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.