2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/86755The phenomenon of Brownian motion and Einstein's contribution to its understanding are introduced in a simple language.10 pages, 2 figs. Elementary article meant for high-school children. Prepared on the occasion of "2005 International Year of Physics". See also physics/0411219Physics EducationPopular Physicstext