Summer sale: Save 58%

Michael Pace

High water cover the road in the Box Town neighborhood as a waste can floats Sunday, May 8, 2011 in Memphis, Tenn. as flood waters continue to rise along the Mississippi River. (AP Photo/Wade Payne) (AP)

US rivers are becoming saltier — and it’s not just from treating roads in winter

Sujay Kaushal, Gene E. Likens, Michael Pace, Ryan Utz