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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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There are more bacteria in your mouth than there are people in the world.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.