Thousands of public school teachers rally outside Chicago Public Schools district headquarters on the first day of strike action over teachers&#39; contracts on Monday, Sept. 10, 2012 in Chicago. For the first time in a quarter century, Chicago teachers walked out of the classroom Monday, taking a bitter contract dispute over evaluations and job security to the streets of the nation&#39;s third-largest city ? and to a national audience ? less than a week after most schools opened for fall. &#40;AP Photo&#47;Sitthixay Ditthavong&#41; <span class=meta>(AP Photo&#47; Sitthixay Ditthavong)</span>
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