The next time you see a semi truck rumbling down the highway, pay attention to the vertical exhaust stacks rising up from behind the cab. These exhaust pipes aren't just for aesthetic purposes: These ...

BLOOMINGTON -- The unusual exhaust pipes on a pickup truck seen in Beason hours before the Gee family was found dead is a mostly "stupid" system that would have required some creative, home-grown ...

Engineers have been meticulously refining the diesel engine's combustion process during the past decade or so, and the result has been a spectacular reduction in the volume of pollutants exiting the ...