2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48637This report, adapted from my talk at the 1998 Ettore Majorana Subnuclear School at Erice, proffers speculative explanations of the strong CP problem and the existence of cosmic rays beyond the GZK bound. It is based on works done with Sidney Coleman and Howard Georgi.8 pages, harvmacHigh Energy Physics - Phenomenologytext