2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47881In these notes, based on a talk given at the Rencontres de Moriond, I give a simple introduction to the tremendous progress that has been made during the last few years towards the understanding of strong-coupling phenomena in quantum gauge theories and superstring theories.8 pages, uses supplied Latex macro, two figuresHigh Energy Physics - PhenomenologyHigh Energy Physics - Theorytext