 South Korea's military assessed earlier this week that the North had launched a hypersonic missile which exploded. It's not clear at this point which Korea's claim, if any, is accurate. Anthony Kuhn, NPR News, Seoul. This is NPR. Iran holds presidential elections tomorrow. The country's late president was killed last month in a helicopter crash. There are four candidates on the Iranian ballot. A rare white bison calf was recently spotted in Yellowstone National Park.