It looks obvious

We are living in a peculiar times, where the fact that North Korea experiment was with a plutonium bomb is considered as good news …

This is good news because we have a reasonably good idea of how much plutonium they have made,” said Siegfried S. Hecker, the former chief of the Los Alamos National Laboratory and now a visiting professor at Stanford University. Mr. Hecker, who has visited North Korea and is one of the few foreigners to have seen parts of its nuclear infrastructure, said that it was his guess that “they tried to test a reasonably sophisticated device, and they had trouble imploding it properly.”

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