 Nuclear power has been emerging as an attractive option for states transitioning away from coal, oil, and other fossil fuels. Proponents of a new generation of smaller reactors have said they'll be cheaper and quicker to bring online. A tree branch fell and killed a woman locally on Capitol Hill this week, leaving neighbors in disbelief. Officials say this morning they may never know exactly what caused this to happen. WTOP Cheyenne Corrine has the story from Southeast.