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The destruction came as a glacial dam burst in Alaska’s capital city on Aug. 5, swelling the Mendenhall River to an unprecedented degree. The bursting of such snow-and-ice dams is a phenomenon called a jökuhlaup, and while it’s relatively little-known in the U.S., researchers say such glacial floods could threaten about 15 million people around the world. “We sat down there and were just watching it, and all of a sudden trees started to fall in,” said Amanda Arra, whose house still hung precariously over the riverbank two days after the floodin...