@eniko I think it's down to two main things?

- zero electrical resistance is obviously great for things like energy transmission and computing. Could bring Moore's Law back from the brink of death or make things like "put a million solar panels in the Mojave and wire it up to Canada" that are currently a pipe dream plausible. Apparently quantum computers would get easier too?

- at certain temperatures superconductors do this really wild thing where they literally exclude magnetic fields from themselves (Meissner Effect). Which means they can essentially levitate in a magnetic field without regard to polarity (so don't need to be carefully balanced or try to spin out of the field). This could be huge for fusion, since a lot of the problem there is creating strong magnetic confinement for the plasma. A lot of recent fusion advancements have come about because of superconductor improvements, from needing to be cooled to near absolute zero to "only" needing to be cooled to a couple hundred degrees below zero C. Also, you know, much better monorails...

Of course it's entirely possible it *is* a superconductor but it's not actually a very good one in some other way or it's hard to make in enough purity. So who knows.