1 About 20+ years ago, a PHD student in nuclear physics assembled open literature data on how to produce an atomic bomb. The information was so accurate that his doctoral thesis was labled top secret, eyes-only. Do you really want to bet that North Korea hasn't taken advantage of the open source literature, Pakistani colaboration, and something interesting from the Chinese? My real concern is not a fission device of relatively low yield but a fusion device in the 10s of kiloton range. it is good to be skeptical but it is also good to have a sense of the science and politics behind nuclear power and explosives.