What could prevent us from making alien technology if we had the schematics?
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This question is inspired by Could medieval people produce automatic firearms if they had access to the schematics? I have simply moved it forwards in time as follows: In 2019 we receive an alien broadcast that tells us in detail how to make an FTL drive (or some other technology that we would have taken centuries to discover on our own). Question Is 2019 technology (not science) sufficiently advanced that given sufficient raw materials, we could make any conceivable human-scale artefact that the aliens specified? I say human-scale to exclude Dyson spheres or anything greater in size than say a pyramid. Specifically: We already have electron microscopes, particle accelerators, incredibly accurate machine tools, nuclear power,etc. Surely we could make anything that the aliens described e...