There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
Eating a house sparrow.
Cityscape, House of Publius Fannius Synistor
This red velvet shoes belonged to Pope Benedict XV
