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In 1987, a year after the breakthrough that revived high-temperature superconductivity, physicists cooled a ceramic of yttrium, barium and copper oxide to 93 kelvin and watched it levitate a magnet indefinitely — the first superconductor cold enough to run on liquid nitrogen instead of scarce, expensive helium
8+ hour, 1+ min ago (347+ words) Anything that superconducts above 77 K can, in principle, be cooled by simply keeping it wet with nitrogen. That opens the door to power cables that lose no energy over long distances, magnets strong enough to levitate trains, and sensitive detectors…...