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Sure, if you only count the very light nano wire toward your energy density and not the giant mechanism to make it useful.
For now, assuming it pans out.
Remember that ~60 years ago, computers less powerful than the microcontrollers in your “dumb” appliances filled entire rooms.
Ok, and in macromechanical?
They claim it does a lot better than existing steel springs — scaling up to meaningful amounts of energy is a research topic.
Huh. So let’s see then. Thanks!
I expect that if this result is reproduced, we’ll see a bunch of people try.