When reporting on last week's sewage spill from Haverhill, Mass., I queried Woods Hole for an expert on the likelihood of polling leaving the Merrimack River and going north along the coast, affecting New Hampshire beaches. Rocky Geyer, an emeritus professor in the Applied Ocean & Engineering Department at Woods Hole Oceanographic Institution, got back to me but too late for any stories; Haverhill had put in a diversion pipe and the immediate problem was over.