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Did you know?
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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There are approximately 3 million unintended pregnancies in the United States each year.
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The average office desk has 400 times more bacteria on it than a toilet.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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There are 20 feet of blood vessels in each square inch of human skin.
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