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There are a lot of nuances here, but overall I think you make a good point.

On the one hand the idea for nuclear fission was still fairly far off in 1912, since even in the 30's many physicists were still skeptical that radioactive energy could be released more rapidly than it normally is in natural substances. On the other hand a couple of major factors leading to it were already known in 1912: the fact that radioactive decay released large amounts of energy and Einstein's discovery of mass-energy equivalence.

As for jet engines the situation is clearer since a pulsejet was already patented in 1906.

I think in 1912 these technologies would seem like semi-plausible science fiction, but not magic.

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