Pass. the core of what we do every day is driven by data, science and engineers. >> reporter: the ceo of general motors testified gm has been unable to replicate the fires. but they are making safety changes to the battery casing and recommending that battery fluid be drained after any accident. in part they said we should suspend our van -- suspend or rancor. that froms "wall street journal." an expert in lithium batteries told the committee the risk of gasoline fires in conventional cars is much greater than that of a battery fire in a chevy volt. megyn: our research team found when all the ...