2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34033The current observational and experimental bounds on time variation of the constants of Nature are briefly reviewed.11 pages, based on a talk presented at "Frontier of Cosmology and Gravitation" (YITP, Kyoto, April 25-27, 2001)General Relativity and Quantum CosmologyAstrophysicsHigh Energy Physics - Phenomenologytext