2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/180551I give a brief overview of recent theoretical developments concerning the high temperature phase of QCD, and the structure of hadronic wave functions at high energy.10 pages. Plenary talk at the 19th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (QM2006) held in Shanghai, China on November 14-20, 2006High Energy Physics - Phenomenologytext