[ryanmercer]

I think you mean stuff that has mostly come to be but first I wanted to throw one out that I really want, an ansible. If we could find a way to communicate faster than light (especially if we could figure out instantaneous communication regardless of distance) just imagine what it would do for space exploration! Instead of waiting 2 years to retrieve seconds of data recorded as New Horizons sailed by Ultima Thule we could have the data real-time or nearly real-time.

If you could figure that out, I think it alone would result in us learning more about our solar system in a couple of years than we have to date. You could send small probes at pretty much everything you wanted and either have a very small amount of buffer memory or just transmit it real time back. You could also have real-time, or much closer to real-time, control of rovers!

Stuff that has come to be:

- Small portable computers (tablets, smart phones)

- Personal communicators (cellular telephones, smart phones)

- 3D printing

- Video phones

- Westinghouse M-27 Phased Plasma Pulse Rifle for fighting Sky... wait we don't have this one yet.