BLADENSBURG, Maryland – Forlorn in the grey distance on a cold wet day, a freight train hoots as professors Jesse Meiller and Barbara Balestra wade shin-deep into the slow-moving, shallow brown Anacostia river.
The place is Bladensburg, an urban area in Maryland just west of Washington DC. For the past 2½ years, the two scientists have visited it once every quarter as the season shifts.
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