Superconductivity

Discovered in the early 1900s, superconductivity is the mind bending occurrence of zero resistance to electric flow.

Resistance to electrical flow decreases as temperature cools but conductors generally have a limit to which they can allow electric flow. Superconductivity occurs when the material is cooled below its critical temperature. Placing 2 like pole magnets next to each other an electrical current is induced, causing the repulsion we are so familiar with. If we have a magnetic rail and place a magnetic puck cooled to superconductive levels, the magnetic field repels the puck along the magnetic rail - the puck moving along without physically touching the rail. This continues until the puck warms up.

Watch the clip.