Superconductor
A superconductor is a material that exhibits zero electrical resistance and expels magnetic fields through the Meissner effect below a critical temperature. Its superconducting state ends when critical conditions such as temperature or magnetic field are exceeded.
In the movie Avatar, humanity invades the planet Pandora to obtain a room-temperature superconductor called "Unobtanium"—literally "un-obtain-ium," the unobtainable material. In real physics, a room-temperature superconductor remains an equally elusive holy grail.
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