2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/189518We review aspects of loop quantum gravity and spin foam models at an introductory level, with special attention to questions frequently asked by non-specialists.20 pages, 11 figures; Contributed article to "An assessment of current paradigms in the physics of fundamental interactions", ed. I. Stamatescu, Springer; v2: several issues clarified, references addedHigh Energy Physics - Theorytext