19 of 73: A public school teacher thanks two boys wearing stickers supporting the Chicago Teachers Union as a large group of teachers' march around John Marshall Metropolitan High School on Wednesday, Sept. 12, 2012 in West Chicago. Teachers walked off the job Monday for the first time in 25 years over issues that include pay raises, classroom conditions, job security and teacher evaluations. (AP Photo/Sitthixay Ditthavong) (AP Photo/ Sitthixay Ditthavong)

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