Superconductivity
Many metals suddenly lose all electrical resistance when cooled below a critical temperature a few (up to 15) degrees above absolute zero. The phenomenon was so unexpected and astonishing that it was studied for most of the first half of the 20th century, to the exclusion of semiconductors that eventually proved more interesting and of greater commercial value.
More recently, ceramics that become superconducting at liquid air temperatures have been found. So far these exotic materials have remained curiosities and have not been employed to revolutionize electric power distribution and application as some initially thought possible.  Ceramic superconductor suspended in a magnetic field at the temperature of liquid nitrogen.

For the future, there are some who dream of making a room temperature superconductor that is durable and easily worked. Who knows - that may be possible - but for the moment do not sell your copper shares.

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