2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/54640Recent developments in superstring theory have led to major advances in understanding. After reviewing where things stood earlier, we sketch the impact of recently identified dualities and D-branes, as well as a hidden eleventh dimension.8 pages, latex, 2 figures; Colloquium-level lecture presented at the Sakharov Conference (Moscow, May 1996)High Energy Physics - Theorytext