Studies of Amazonian languages challenge linguistic theories

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Yet, the Pirahã language and culture has several features that not known 
to exist in any other in the world and lacks features that have been 
assumed to be found in all human groups. The language does not have 
color words or grammatical devices for putting phrases inside other 
phrases....Moreover, Pirahã suggests that it is not always possible to 
translate from one language to another.

http://www.eurekalert.org/pub_releases/2005-08/uocp-soa080205.php