2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/17000This Letter reports a new wave phenomenon. We show that wave energy can be stored in random media. Associated with such energy storage is a global collective behavior. The features depicted are so general that they may be observed in many random systems.3 pages revtex file, 1 eps figuresCondensed Mattertext