Combustible lemons. But failing that, a portal gun.
this post was submitted on 03 Mar 2024
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Asklemmy
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Arcologies or greenhouse super domes for food production of any kind wherever it's desired
Or carbon nanotube mass production so we can build mile-high connected super structures
Being able to photosynthesize. It wouldn't be that hard either, we already can, just not to make food.
Matter transporters for work and holodecks for play.
Replicator. But that kinda seems impossible so that Black and Decker rehydrator thingy from Back to the Future II.
Cybernetics hands down.
Universal translator
I would stay in relatively achievable things like a sugar fuel cell or microbial food production. Things we don't quite have yet but not do to the knowledge not being there.