Superconductivity at -20 C.

[wrtner]

A fair way off useful but getting there:

https://interestingengineering.com/s...ter-23-05-2019

Maximum strength salt water should just about do it.
.

[RAMSET]

some have problems opening that link

here is the [one] source article

https://www.nature.com/articles/s41586-019-1201-8

thanks for sharing this.

Chet