- a team in china has succeeded in growing a crystal of LK-99 and levitating it in a magnetic field
- two independent teams did first-principles theoretical analyses of LK-99 and found that it might indeed be a superconductor, but with caveats: the electronic properties which suggest superconductivity depend on substituting a copper atom in one particular site in the crystal and it's the less energetically-favorable one of the two, and bulk superconductivity might depend on growing a monocrystalline sample
- half a dozen other experimenters have tried and failed to reproduce the original findings, which seems consistent with the theoretical findings that it might be superconducting but only if you're really lucky1
https://www.science.org/content/blog-post/room-temperature-superconductor-new-developments
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figuring out how to get luckier will be the work of materials engineers
