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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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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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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.