During the sweltering Easter holidays in Guadalajara, Mexico, in 1992, the Reforma district reeked for days. Everything smelled of gas, but no one could figure out precisely where the source was. Tap water stank. Manhole covers rattled where they sat in the street. On Wednesday, April 22nd, one explosion after another tore through the working-class neighborhood and left the streets a ragged canyon winding through Guadalajara.