2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/15942It is believed that almost any pair of people in the world can be connected to one another by a short chain of intermediate acquaintances, of typical length about six. This phenomenon, colloquially referred to as the ``six degrees of separation,'' has been the subject of considerable recent interest within the physics community. This paper provides a short review of the topic.9 pages including 3 postscript figures, bibliography updated and minor corrections to text in this versionStatistical MechanicsDisordered Systems and Neural NetworksAdaptation and Self-Organizing Systemstext