I'm still waiting for sidewalks, driveways, and roads that melt snow and ice.
Back in the early 60s at grade school we'd get to watch these newsreels put out by the atomic energy commission about the world of 1975 (aka the future). In 1975 (aka the future) the electricity generated by all the nuke plants would be so inexpensive and so plentiful that we would put coils in our walks and driveways and roads to melt the ice and snow in the winter.
The good news is that on Thursday a hoverboard will be invented.
The bad news is that on Friday the Sun will implode.