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The average office desk has 400 times more bacteria on it than a toilet.
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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.