1) The document summarizes new information presented in the second edition of the book "Cataclysms on the Columbia: The Great Missoula Floods" including updated dates, maps, photos, and science about massive floods that occurred in eastern Washington and Oregon around 15,000-18,000 years ago. 2) The floods, known as the Missoula Floods, were caused by the sudden drainage of a large pro-glacial lake in western Montana on multiple occasions. They carried over 1,000 cubic miles of water and deposited distinctive geological features across hundreds of miles. 3) New dating techniques have helped scientists better understand the timing and impacts of these floods, which were among the