How to Train a Dog to Smell Disease

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In the early 2000s, Claire was training her bio detection dogs so that they could smell disease. But then her work took a turn when one of her dogs started to look upset. She felt the spot where Daisy was nudging and she could feel a lump. And I actually went on to be diagnosed with a very, very deep-seated, early-stage breast cancer.

Believe it or not, scientists still don't know how the sense of smell works. But they're looking at how powerful it is - dogs can actually sniff out cancer and many other diseases - and they're trying to figure out how to reverse engineer it. In fact, one MIT scientist may have built a robot nose ... without completely understanding how his invention works.

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