Pirahã

Wow, this article is very fascinating.

http://www.newyorker.com/reporting/2007/04/16/070416fa_fact_colapinto

One of my favorite passages from it:
By the next morning, Fitch had debugged his software, but other difficulties persisted. One subject, a man in blue nylon running shorts, ignored instructions to listen to the syllables and asked questions about the monkey head: “Is that rubber?” “Does this monkey have a spouse?” “Is it a man?” Another man fell asleep mid-trial (the villagers had been up all night riotously talking and laughing—a common occurrence for a people who do not live by the clock). Meanwhile, efforts to get subjects to focus were hampered by the other tribe members, who had collected outside the hut and held loud conversations that were audible through the screened windows.