Article: Potomac Heritage Trail: winding ribbon of American history.

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"You mean you want us to go in the water?" squeaks a surprised 12th grader, peering warily into the murky C&O Canal in Great Falls Park, Maryland, just north of Washington, D.C. She and her fellow students--most wearing outfits better suited to a night on the town than a day on a riverbank--stare dumbfounded at park ranger Harry Hagan as he holds up a large rectangular net.

"Yep, you're going in," says Regina Leonard, a teacher with Bridging the Watershed, a program for high school students studying ecology. "The more thorough you are at sifting through the debris" she tells the 20 students, "the more critters you'll find." And ...

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