Quote:
Originally Posted by Monahammer
Jet and ionic propulsion were both entirely new when conceived, and both emerged in the era following supposed crash retrieval programs.
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No, they really weren't...
https://en.wikipedia.org/wiki/History_of_the_jet_engine
Jet engines can be dated back to the invention of the aeolipile around 150 BC. This device used steam power directed through two nozzles so as to cause a sphere to spin rapidly on its axis.[1] So far as is known, it was not used for supplying mechanical power, and the potential practical applications of this invention were not recognized. It was simply considered a curiosity.
Just because they seem to you like there's no precursor doesn't mean that's the case.
My favorite show as a kid was James Burke's Connections - you should check out some episodes on youtube.