Good question. There are lots of really cool things in sci-fi, like lightsabres, or holodecks.
I would choose a Stargate from the film and TV series. It’s a portal that creates a wormhole between two Stargates, allowing you to go anywhere in the universe, as long as there is another gate. You could visit lots of planets instantly that way!
A teleporter for sure. Scientists are working on teleporters now but they can only teleport a few particles over a certain distance. Full scale teleporters would be great.
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