New York Times: The flow of mud, boulders and trees that overran part of the community of Oso on Saturday was the most lethal slide experienced in Washington in years, but the state is prone to the destructive events. At times, parts of the state have experienced a thousand or more slides over just a few days, according to state officials, although most are small and cause far more limited destruction. Lynn Highland, a geographer with the United States Geological Survey, said Washington ranks with Oregon and California...