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A Tale Of Two Cities: Mixing The Urban Poor Into A Rich Urban Life

The escalators in Medellin, Colombia, on Dec. 26, 2011, the day of their inauguration. (NPR; Photo: Raul Arboleda/AFP/Getty Images)

The escalators in Medellin, Colombia, on Dec. 26, 2011, the day of their inauguration. (NPR; Photo: Raul Arboleda/AFP/Getty Images)

The escalators in Medellin, Colombia, on Dec. 26, 2011, the day of their inauguration. (NPR; Photo: Raul Arboleda/AFP/Getty Images)