It may be possible to find a cure for many of the currently considered incurable diseases. There are rumors about flying cars. Also insanely developed artificial intelligences, although how much we really need them is unknown.
From the possible for the next 20-40 years:
Artificial intelligence is many times superior to human.
Expeditions to Mars.
The development of thermonuclear energy.
The fusion of the human mind with the electronic environment.
But this is not accurate))