The power of speechWhen Daniel Everett first went to live with the Amazonian Pirahã tribe in the late 70s, his intention was to convert them to Christianity. Instead, he learned to speak their unique language - and ended up rejecting his faith, losing his family and picking a fight with Noam Chomsky.
http://www.guardian.co.uk/world/2008/nov/10/daniel-everett-amazon