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Superconductivity is a unique state in which electrons move freely inside a solid material. This complete lack of electrical resistance could translate to incredibly efficient electric power cables, as well as many other promising technologies.But there's a hitch. Most superconductors become that way only at very low temperatures, often near absolute zero (around -273 degrees Celsius or -460 degrees Fahrenheit). To chill a material enough so that its electrons become "unglued"...