“NBC Learn, an educational division of the television network, came to Baltimore recently to report on how the physical alteration of streams in urban areas makes it that much harder for them to handle polluted storm-water runoff. It highlights research on area streams that’s being led by Claire Welty, a hydrologist at University of Maryland Baltimore County,” writes Tim Wheeler of the Baltimore Sun. Welty, the Director, Center for Urban Environmental Research and Education (CUERE) and professor of chemical, biochemical, and environmental engineering takes NBC Learn on a tour of Baltimore’s streams. “With NBC correspondent Anne Thompson narrating, Welty shows …