Detroit public school teachers Ngozi Umachi (L) and Paulette Zubek join teachers and union members in a rally to demand fair contract negotiations during their American Federation of Teachers (AFT) convention in Detroit, Michigan, July 26, 2012. In the maelstrom of criticism surrounding America's unionized public teachers, Randi Weingarten, the woman running the second-largest educator union says time has come to collaborate on public school reform rather than resist. Photo taken July 26, 2012. REUTERS/Rebecca Cook (UNITED STATES - Tags: CIVIL UNREST EDUCATION BUSINESS EMPLOYMENT)