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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).
The longest a person has survived after a heart transplant is 24 years.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
The familiar sounds of your heart are made by the heart's valves as they open and close.