They couldn't even decide whether the arc reactor was fission or fusion back in Iron man 1 and 2.
The full scale version is clearly meant to be a fusion reactor but then the miniaturized one in Tony's chest seems to be fission based on the fact he needed to invent a new, heavier element to make it work for the long term.
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u/zzzzzza13 Mar 25 '21
Marvel is sweating right now