3 ms·

4K is not very useful, but it is progress non the less. https://en.wikipedia.org/wiki/List_of_superconductors https://en.wikipedia.org/wiki/List_of_superconduc

• hendler 11y ago
  Highest listed there 39K https://en.wikipedia.org/wiki/Magnesium_diboride https://en.wikipedia.org/wiki/Magnesium_diboride Doesn't mention others at https://en.wikipedia.org/wiki/High-temperature_superconductivity https://en.wikipedia.org/wiki/High-temperature_superconducti... like https://en.wikipedia.org/wiki/Hydrogen_sulfide https://en.wikipedia.org/wiki/Hydrogen_sulfide More at https://en.wikipedia.org/wiki/Room-temperature_superconductor https://en.wikipedia.org/wiki/Room-temperature_superconducto...