*рационализм *велосипед >The researchers, led by Professor Jonathan Grigg from Barts and the London School of Medicine, compared carbon levels in the lungs of five healthy bicycle commuters those of five healthy pedestrian commuters. The bicyclists had 2.3 times more of the bad stuff in their lungs. Presumably, the cyclists' heavy breathing -- all that good aerobic stuff -- is responsible for the increased presence of black carbon.