@wellerstein 2) Easier technologically 2 go that big using fusion vs fission, relatively speaking?
Whereas if you can add fusion, it pushes your weight up by only a bit (1960s warheads had 10-20 kg of LiD), but yield goes up dramatically
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Whereas if you can add fusion, it pushes your weight up by only a bit (1960s warheads had 10-20 kg of LiD), but yield goes up dramatically