What would be the best thing that could be invented?
The Best Future Invention?Market Research
Efficient rechargeable battery with no wearout mechanism and no requirement for esoteric materials.
Some tricky ones here. If we had immortality, and could cure all deseases, where would we put all the people, house them, feed them, etc ? We’d urgently need teleportation to send them somewhere else, or maybe time travel to send them forwards or back in time. As for mind reading and lie detecting … I’d rather not know, thanks. Holographic TV sounds reasonable harmless, as HD and flat screen 3D do nothing for me.
How about a cure for hangovers?
A propulsion system that exceeded the speed of light for spaceships(warp drive in Star Trek terms). This would allow us to visit other planets within our lifetimes.