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The realization that a purple sunset in Wisconsin traced back to the 1991 volcanic eruption of Mt. Pinatubo in the Philippines fueled Chip Trepte’s interest in the movement of volcanic aerosols in the upper atmosphere. “It was a stunning revelation...
William Putman, research meteorologist with NASA , was always fascinated by the way meteorologists on television could predict what was going to happen. But instead of comparing weather reports with the blowing of the trees outside his house, Putman now...