Asklemmy

Two chicks at the same time.

Space based mirrors for asteroid mining. Bounce a sh*tton of light from the sun around and just melt asteroids. Love that in the Troy Rising series.

Lots of problems getting there irl (need a better way to get out of the gravity well, and light speed lag for command and control would be a real issue) but the idea is just too fun.

Replicator. But that kinda seems impossible so that Black and Decker rehydrator thingy from Back to the Future II.

genetically engineered housing

Hoverboards obviously.

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.

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

I would fund a truly fair AI and a very gentle, but firm, self replicating robot army to enforce it's benevolent will on everyone.

So basically SkyNet, after I make a pointer arithmetic mistake.

Consciousness storage and transfer

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

That has a real chance of existing? Something with clean power.

That I really want? Replicators. Man think about a life not having to cook or clean dishes.

room temp superconductors.

The fiction part would kind of keep me from doing that. And I fully believe that everything that actually is possible is already being worked on as quickly as possible.

So, maybe just pay for a whole lot of renewable energy plants all around the globe. Buy up all fossil fuel plants, demolish them and put in renewables instead.

Or fund a fully open smartphone with modular components like a PC with good specs and an optional keyboard.

Matter transporters for work and holodecks for play.

Earth unity. Whatever they did to make humans stop attacking each other was crazy.

We probably need another species to compete against to unite us. I'd put Billions into nasa to find aliens so we can fight them.