Illiteracy is a social ill that grates on a nation's conscience, raises painful visions of a stubborn ailment curable only by radical political surgery. Yet Mexico is showing the rest of the world that the condition can be successfully attacked with a combination of persistence, pesos and ingenuity. In 20 years, it has slashed its illiteracy nearly in half—from 52% to less than 28%.
In the rugged hills near Piaxtla, an isolated village in the state of Puebla, a modern auto recently pulled a bright orange trailer toward a group of waiting...
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