2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/117664In this talk, I address some recent developments in chiral perturbation theory at unphysical and physical quark masses.Plenary talk delivered at the 5th International Workshop on Chiral Dynamics, Theory and Experiment (CD 2006), September 18 - 22, 2006, Durham/Chapel Hill, NC, USAHigh Energy Physics - Phenomenologytext