What DO we know about high Tc?

@article{Leggett2006WhatDW,
  title={What DO we know about high Tc?},
  author={A. Leggett},
  journal={Nature Physics},
  year={2006},
  volume={2},
  pages={134-136}
}
From twenty years of experimental research, we can draw several conclusions that do not depend on any particular model of high-temperature superconductivity. With these in mind, it's time to assess the theoretical landscape, and wonder whether we have been asking the right questions. 
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