Here’s what’s different from last time:
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it’s more like “room temperature” than room temperature, the paper says 250K which is -23 C.
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it has already replicated, with two separate labs in China confirming the results.
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The chemical difference appears to be that this thing has sulphur where LK-99 did not.
No, the west published a bunch of sensationalist news articles about it and then Chinese scientists had to correct them. Science journalist rarely know anything about the topic they are reporting on, and their primary job is to sell newspapers (or clicks) so they sensationalize everything.