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