And I do mean cool. Slashdot today reports on an advance in superconductors. As usual there's more noise than signal, this time not only on the slashdot end but also in any of the sources that could be used to talk about the story. Charitably, the title used is clear but these articles could all be improved.
The best article so far is behind a paywall at IEEE but the abstract here tells you all you need to know without getting lost in the details. The sapphire strand is being used as a place to hang a real high-temperature semiconductor that uses Yttrium, Barium, Copper and Oxygen. The results keep a low temperature more easily and are superconducting at microwave frequencies and 77 K (around the boiling point of Nitrogen -- "high temperature" in superconductors is different than "high temperature in weather).