Asklemmy

I’m convinced that, despite his denial, Isaac Asimov’s psychohistory was a Red Scare-dodging caricature of historical materialism / scientific socialism. I’d put my money there.

Also clean energy but personally virtual reality 100%. Give me that SAO experience, damn it. Just without y'know the bad stuff

Edit: mandatory Link

Combustible lemons. But failing that, a portal gun.

Giving it all away to mutual aid groups to have them figure out local issues.

Catgirls

and space adapted humans

• radiation resistance (I think charnobyl wolves have that already)
• better eyeballs, digestive system and bones
• propulsion system
• vacum survivability

Hoverboards obviously.

Not so much technology, but I'd fund the Howard Society for real. For those unfamiliar, it's a program to identify people who are genetically predisposed to natural long life and pay them to have kids with each other; it's a core plot point in a bunch of Heinlein novels.

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

• Space tether.
• Nuclear fusion.
• Home assistant robots

Neurotransmitters into apes

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.

https://en.wikipedia.org/wiki/Optical_computing