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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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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 adult has about 21 square feet of skin.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.