LK-99

It looks like it isn't a room-temperature superconductor after all. Not just that, but it's not even highly conductive. Normally I'm skeptical of new technologies until they're proven to be effective, but the apparent positive response from a lot of people had me cautiously optimistic. It's kind of ironic that the one time I'm a bit of a techno-optimist, the technology in question doesn't pan out.

Anyway, I'd initially heard that the results might help design superconductors even if this didn't pan out, but if it's as horrible as it sounds I don't see how it would.