The June 2016 elections saw the share of seats held by women skyrocket from 16% in 2013 to 40% in 2016 - a remarkable increase considering that the Durango Congress brought up the rear of the 32 states for women’s representation, but now ranks 14th. Nevertheless, women’s state-level representation still varies - from 60% in Chiapas to 20% in Morelos. Where does the 30% “critical mass” for women’s political representation come from? Borrowed from nuclear physics where it indicates the quantity of plutonium necessary to produce a nuclear explosion, the concept was first applied to gender in the 1970s by an American scholar, Rosabeth Moss Kanter (Kanter, 1977).