WASHINGTON, (AP) -- A major source of chemical contamination in the Arctic turns out to be bird droppings. Wind currents and human activities long have been blamed for fouling the pristine Arctic. But a study by a group of Canadian researchers found that the chemical pollution in areas frequented by seabirds can be many times higher than in nearby regions. Researchers led by Jules Blais of the University of Ottawa studied several ponds below the cliffs at Cape Vera on Devon Island in the Canadian Arctic. Scientists report in Friday's issue of the journal Science that the ponds, which receive...