On NPR today, David Kestenbaum reports that engineers and scientists are analyzing exactly how New Orleans flooded after Hurricane Katrina. In addition to reported breaks in the floodwalls, a major with the Army Corps of Engineers says he believes the hurricane probably created a 20-foot wall of water — what he calls a "tsunami effect." Henry Rodriguez, president of St. Bernard Parish, told Kestenbaum the first help he saw after the flooding came from another country — fifty Canadian mounties, on day two of the disaster. Link