2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/16794This paper is extracted from an opening address given at the workshop "Wetting: from microscopic origins to industrial applications" (Giens, May 6-12, 2000). It discusses two special points a) the nature of line energies for a contact line b) the aging of emulsions.6 pages, 4 EPS figures, submitted to Colloids and SurfacesSoft Condensed Mattertext