It's been more than 60 years since the US successfully tested the first hydrogen bomb. Since then only four other countries—Russia, France, China, and the UK—have been able to make one themselves. This week North Korea claimed it had, but you can disregard Kim Jong-un's boast for now. (Update Sept. 3: The regime has yet again claimed to have tested a hydrogen bomb.)
A few more countries—India, Pakistan, South Africa, Israel, as well as North Korea—have the know-how to build simpler forms of nuclear weapons: atomic bombs. Still, no other technology in the world has remained out of the hands of so many countries for such a long time. Why?
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