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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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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 word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.