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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).
Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.