It’s not what you look at that matters, it’s what you see. — Henry David ThoreauThe plaintiffs’ complaint, filed in U.S. District Court in Wisconsin, alleges that a defective lithium-ion battery from their son’s laptop computer was the cause of the fire that took his life.Their case was supported by the opinions of two expert witnesses. The first, Daniel H. Doughty, was a PhD in inorganic chemistry and an expert on battery safety and the second, Michael F. Hill, was a retired fire investigator …