In the realms of electronics, magnetism, and quantum mechanics, superconductivity has an almost mythical status. Some materials, when cooled to a critical temperature, electrical resistance instantly drops to zero and magnetic fields are completely ejected. Superconducting magnets are already used in MRI machines and particle accelerators like CERN's LHC, and are being considered for advanced maglev trains. Zero electrical resistance means that a current can flow around a superconducting coil indefinitely (at least 100,000 years) without any applied voltage -- a feature that could completely revolutionize power distribution, power storage, electric motors, computers, and more.
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