Giant nanomechanical energy storage capacity in twisted single-walled carbon nanotube ropes

In this case, it'll end up looking more like a block of billions of microscopic springs. Still in the phase of interesting-lab-demo rather than something that's production-ready.

For now, assuming it pans out.

Remember that ~60 years ago, computers less powerful than the microcontrollers in your "dumb" appliances filled entire rooms.