The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
Apparent and True Orbits of Alpha Centauri.
True-color image of layers of haze in Titan's atmosphere.