Thousands of public school teachers and students march in Cali, department of Valle del Cauca, Colombia, on May 4, 2015 demanding better pay and reforms in the education system. The strike of public school teachers continued after the national government and the teachers are not put agree on the amount of salary increase -- a move that affects about nine million students and is rejected by the government. AFP PHOTO/LUIS ROBAYO (Photo credit should read LUIS ROBAYO/AFP/Getty Images)
