Vaccines prevent between 2.5 and 4 million deaths every year.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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There are more bacteria in your mouth than there are people in the world.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.
The internal structures of the outer, middle, and inner ear.