Ljiljana Rajic, an associate research scientist in Northeastern’s Department of Civil and Environmental Engineering, spoke with Charles Snow, of MBE Cleantech, on Wednesday at the 2015 Water Innovation Exhibition in the Curry Student Center. Rajic was explaining how engineers working for the Puerto Rico Testsite for Exploring Contamination Threats program have developed an innovative way to remove a number of contaminants from water using electric currents produced by solar panels. Photo by Matthew Modoono/Northeastern University