This is really amazing:

Sept. 24, 2004 — For years, dog owners have been informing their doctors about the apparent disease-detecting ability of their pets, and today those claims gain some credibility with the release of the first ever peer-reviewed scientific study showing that dogs can smell cancer.

The paper, published in the British Medical Journal, tested whether canines could sniff out bladder cancer within urine samples. The researchers believe dogs probably can smell other cancers and diseases, such as tuberculosis.

But I ask, with all these wonderous things we can train dogs to do, why do we need $50,000 dynamometers to do smog checks? 😀