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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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According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.
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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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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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In 1864, the first barbiturate (barbituric acid) was synthesized.