It's an idea that's been played with a few times, but there are many energy loss points in such a system, as well as logistics for keeping the "stack" from falling over. The best so far is pumping water up to an artificial lake, but that's still not very efficient.
I love Foundation. It's one of the few times I've seen something that they've diverged so much from the source material yet made an enjoyable story that is still recognizable.
Ghost in the Shell was horrible. She played the Major as a completely different character than the original. Scarlett Johansen plays a really good seductive spy, but that's all she plays. Major Kusanagi was ace.
Which ones? I got a set of Moondrop Para2s, and while I love the clarity on treble forward music I still go back to my MDR-CD770s for anything more bass heavy.