The surprising thing that happens is that all electrical resistance
completely disappears. It doesn't just become very very very very
very small. It literally becomes totally ZERO.
When the material is in that state of being, you can make a loop
out of it and start some current flowing in the loop, and as long as
you keep the superconductor cold enough, the current will keep going
around and around and around and around, with no loss, for MONTHS
if you want to.
It's really surprising.
