Ellen Emerson may be the last living survivor of the Johnstown flood. She was only four years old on May 31, 1889, when twenty million tons of water decimated her hometown of Johnstown, Pennsylvania. Thousands perished in what was the worst natural disaster in U.S. history at the time. As we witness in The Johnstown Girls, the flood not only changed the course of history, but also the individual lives of those who survived it. A century later, Pittsburgh...