2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/182139We argue that a non commutative geometry at the Compton scale is at the root of mass, Quantum Mechanical spin and QCD and electromagnetic interactions. It also leads to a reconciliation of linearized General Relativity and Quantum Theory.11 pages, tex Talk at the Eight International Symposium on the Frontiers of Fundamental Physics, Madrid, October, 2006General Physicstext