There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The largest baby ever born weighed more than 23 pounds but died just 11 hours after his birth in 1879. The largest surviving baby was born in October 2009 in Sumatra, Indonesia, and weighed an astounding 19.2 pounds at birth.
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The average office desk has 400 times more bacteria on it than a toilet.
Posterior view of the Heart, outlining the major arteries
Major fluid compartments in the body
Focus on older adults - risk for infection
Trump coverage in major news networks
The three major mechanisms for facilitated transport