Being able to photosynthesize. It wouldn't be that hard either, we already can, just not to make food.
this post was submitted on 03 Mar 2024
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It's not really science fiction since there are scientists working on it right now, because capitalism is the brake of development. I would invest on photonic computer research, that would help advancement of society in all aspect.
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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.
Cybernetics hands down.
Universal translator
A better battery would be nice.
Replicator. But that kinda seems impossible so that Black and Decker rehydrator thingy from Back to the Future II.
Matter transporters for work and holodecks for play.