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Battery busses and BEMUs, even though this board likes to be contrarian about them. It's pretty proven tech at this point and solves urgent problems (diesel fumes, noise and CO2 emissions if done right).
For all other things (drones, hyperloop and whatnot) im pretty sceptical. Over the last like 100 years we've had quite a lot of "revolutionary" tech that just ended up in small niches or was completely abandoned. Think of hovercraft, aerotrain, peoplemovers, transrapid, zeppelins etc.
