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At Argonne National Laboratory, a vehicle's wheels spin on the Dynamometer, a kind of treadmill for cars, that lets engineers run road and emissions tests on cars in a controlled way. Original public domain image from Flickr

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At Argonne National Laboratory, a vehicle's wheels spin on the Dynamometer, a kind of treadmill for cars, that lets engineers run road and emissions tests on cars in a controlled way. Original public domain image from Flickr

More