2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/166519According to Alisa Carrigan's opinion in Physics Today Dec 2007, to prevent proliferation of nuclear weapons, certain rules should be set to prevent the spread of a particular kind of knowledge. Here, I argue that a knowledge blockade does not work, and it is not a suitable means to establish a sustainable peace.A shorter version of this will appear in Physics Today, October 2008, as a letterPhysics and Societytext