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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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The average office desk has 400 times more bacteria on it than a toilet.
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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.