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Frae Wikipedia, the free beuk o knawledge
A magnet levitatin abuin a heich-temperature superconductor, cuiled wi liquid nitrogen. Perseestent electric current flaws on the surface o the superconductor, actin tae exclude the magnetic field o the magnet (Faraday's law o induction). This current effectively forms an electromagnet that repels the magnet.

Superconductivity is a phenomenon o exactly zero electrical reseestance an expulsion o magnetic flux fields occurrin in certain materials, cried superconductors, whan cuiled ablo a chairacteristic creetical temperatur.