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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.
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There are 60,000 miles of blood vessels in every adult human.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
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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.