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The practice of designing structures or systems that account for or exploit the curvature of spacetime, which is either extremely advanced physics or a really fancy way of saying "building things that work in gravity." In practice, spacetime [engineering] means accounting for [relativistic] effects in GPS satellites (they'd be useless otherwise), designing experiments to test [general relativity] (dropping things from tall towers, basically), and theoretically, one day, maybe building a wormhole (good luck with that). It's engineering at the edge of known physics, where the safety margins are unknown and the building codes haven't been written yet.
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