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Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Illicit drug use costs the United States approximately $181 billion every year.