Teacher Ivania Guevara demonstrates during class to the children with hearing problems in the Melania Morales School in Managua, Nicaragua, Sept. 22, 2004. 

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In the mid-1980s, linguists stumbled upon a kind of natural experiment on language creation — a sign language being used by deaf children in Managua that was only a few years old.

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Teacher Ivania Guevara demonstrates during class to the children with hearing problems in the Melania Morales School in Managua, Nicaragua, Sept. 22, 2004. 

Credit:

Oswaldo Rivas/Reuters 

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