fusion
when will we get it?
how fast would it be usable?
how would it affect national and global economy?
(In the movie "Chain reaction" one character states that the economy would colapse with free energy.
In time would it make everything as expensive as human labor?
free power would run machines that were made by free power and were transported with vehicels the used free power, etc. I guess materials would still have value, so its human labor and materials.
anything else