To get a really good sense of why Caroline Solomon is a great teacher, you have to go into the field with her. On this particular morning, that means a boat on the Anacostia River.
We're about 4 miles from the campus of Gallaudet University, where Solomon is a professor of biology. She and a student — Anna McCall — are heading in a small boat to take water samples.
The Anacostia is no more than 8 miles long, but it meanders through and around Washington, D.C., past a naval yard, a golf course and I-95, the busiest interstate highway on the Eastern Seaboard.