Superconductors are already pretty miraculous. Every material conducts electricity to a greater or lesser extent—think copper versus rubber. Supercooled to below 20 degrees Kelvin, materials lose all resistance. But getting there is energy-intensive and expensive. (At 0 degrees K—absolute zero—all molecular motion ceases.) In 1987, a researcher at the University of Houston discovered a ceramic that was, superconductively speaking, a cheaper date, losing resistance at a more easily attainable 94 degrees K. That's about –290 degrees Fahrenheit, still not convenient for the dream applications of superconductivity like loss-free transmission of electricity, but good enough to experiment on.