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> My issue here is: This new material is essentially standard "high temperature" YBCO superconductor material just slightly modified, or? The authors are not doing anything dramatically new, like a new chemistry.

There is no Pb in YBCO, what are you on about?

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That is what I would call a slightly modified approach. They just "bake something together" and hope to get lucky. No way.

Anyway, I am not an expert. I hope they have a win here, but hard to believe at this point.

AIUI The only thing in common is they both contain copper.

Not an expert either, and extremely skeptical myself. The poor videos claiming to demonstrate levitation just seemed to show diamagnetism and eddy current reactions.

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