If this site is accurate, it’s now possible to have superconducting material at household freezer temperatures: 254k, or a tiny bit below 0F. From power lines to maglevs to supercolliders to energy storage, the potential applications boggle the mind. -m
Note: I’m having trouble finding independent verification of this, other than what appears to be re-hashes of the superconductor.org article. If you have any additional proof or refutation, please post it in the comments.