Dan Rodricks: Dolphins in the Chesapeake Bay; here’s what their presence tells us — and doesn’t. | STAFF COMMENTARY

Though they have big brains, the Atlantic bottlenose dolphins that visit the Chesapeake Bay cannot be expected to have the capacity to read a report card. They have no way of knowing the waters they’ve been cruising all summer received a D+ grade last semester. “Efforts to restore the bay are struggling to reduce agricultural pollution,” the Chesapeake Bay Foundation said in its annual report card in January.