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FILE - In this April 8, 2012 file photo, a North Korean soldier stands in front of the country's Unha-3 rocket at a launching site in Tongchang-ri, North Korea. It really is rocket science and it really is hard. North Korea proved that again. The giant explosion that gets a rocket off the ground isn't that complicated. Controlling that reaction and going where you want, when you want - that's where engineers earn their money and ulcers. And it's where past rockets and spaceships have ended in spectacular and sometimes deadly failures. (AP Photo/David Guttenfelder, File)