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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.
Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.