A year after Lance Wheeler attracted international attention for his research detailing a window that could both darken and generate electricity, he’s starting over – almost from scratch. “Our way was the easiest to get to the goal of making a switchable energy-generating window,” said Wheeler, a research scientist at the U.S. Department of Energy’s National Renewable Energy Laboratory (NREL). “Now, we’re stepping back to determine the best way to do this – instead of the easiest or mo...