2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/146917A few recollections and afterthoughts on the development of the string picture of fundamental interactions out of the S-matrix program.Contribute to the collective volume "The birth of String Theory", edited by A. Cappelli, E. Castellani, F. Colomo and P. Di VecchiaHistory and Philosophy of Physicstext