Years from now, machines may be able to diagnose diseases like cancer simply by analyzing a patient's smell. Several international companies are using analytics and artificial intelligence to create new diagnostic tools that can pinpoint diseases using odor analysis, according to The New York Times. Developers in England and Israel have begun testing their diagnostic tools in the clinical setting with some success--including one professor who recently published a study showing that his tool could accurately diagnose 17 different conditions based on breath samples. In the U.S., researchers at the University of Pennsylvania are working to develop a prototype that uses odors in blood plasma to recognize ovarian cancer. A study published in January by researchers at Northeastern University indicated that a new class of medical devices known as "e-noses" is gaining traction in the medical community.