About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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If you could remove all of your skin, it would weigh up to 5 pounds.
The most abundant elements found in living organisms