harder to identify because these problems are optimal for a physicist's career
## 100 problems?
- why is superconductivity 2-dimensional in cuprates? One possibility is a role of unscreened Coulomb energy
- [cooling of quantum spin-glasses](https://knowen-production.s3.amazonaws.com/uploads/attachment/file/2415/Zero-temperature_quantum_annealing_bottlenecks_in_.pdf)
