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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).
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.