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Did you know?
The human body produces and destroys 15 million blood cells every second.
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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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.