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That means North Korea is likely to stick with the standard spherical implosion fission bomb it has already developed.

If further enriched, this quantity could yield more than 30 kilograms of weapons-grade uranium, enough to build one fission bomb.

Berg’s assignment is to determine whether the scientist is making a fission bomb for the Nazis.

Fusion bombs release so much more energy than fission bombs that it’s hard to comprehend.

It would have lacked the energy to sustain itself under normal conditions, however, the fission bomb provides it with all the energy it requires to grow and become self-sustaining.