In 1957 Reviews of Modern Physics published a conference talk by Feynman, Superfluidity and Superconductivity. The last paragraph is fascinating where he laments the problem of finding a theory of superconductivity.
[Click to make it larger]
This highlights just how brilliant BCS were!
Coincidentally, BCS published their theory the same year.
Gell-Mann and Feynman in 1957 
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