Abstract :
Flow measurements are reviewed with particular emphasis on the hydrodynamic character of elliptic flow at RHIC. Hydrodynamic scaling compatible with the production of highly thermalized matter having a high degree of collective interactions and extremely low viscosity, is observed for a broad selection of the data. These properties suggest the production of a new state of strongly interacting nuclear matter at extremely high density and temperature where the relevant degrees of freedom are the valence quarks, ie. the sQGP.
