NATION NATION NATION Yellowstone hot spring Beth Harpaz / Associated Press The Norris Geyser Basin in Yellowstone National Park, Wyo. The Norris Geyser Basin in Yellowstone National Park, Wyo. (Beth Harpaz / Associated Press) Associated Press The grisly death of a tourist who left a boardwalk and fell into a high-temperature, acidic spring in Yellowstone National Park offers a sobering reminder that visitors need to follow park rules, park officials and observers said. Efforts to recover the body of Colin Nathaniel Scott, 23, of Portland, Ore., were suspended on Wednesday after rangers determined there were no remains left in the hot spring. Scott's death follows a string of incidents raising questions about tourist behavior at the nation's first national park as visitor numbers surge. That includes people getting too close to wildlife and enterin...