Slides of a presentation given at the UFS Schneefernerhaus.

[1] P. Moll, P Kushwaha, N. Nandi, B. Schmidt, and A. Mackenzie: Evidence for hydrodynamic electron flow in PdCoO2. Science 351, 1061 (2016).

[2] T. Scaffidi, N. Nandi, B. Schmidt, A. Mackenzie, and J. Moore: Hydrodynamic Electron Flow and Hall Viscosity. Phys. Rev. Lett. 118, 226601 (2017).