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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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).
More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
Excessive alcohol use costs the country approximately $235 billion every year.