BROADCAST 21/1/2013 TIME 21:30 CHANNEL ABC1 DURATION 55 THE GRAMMAR OF HAPPINESS RATING INSTITUTION:. COPY DATE: Made under Part VA Copyright Act 1968 for educational purposes. THE GRAMMAR OF HAPPINESS The Grammar Of Happiness follows the story of Daniel Everett amongst the extraordinary 'unconvertible' Amazonian Piraha tribe, a group of indigenous hunter-gatherers whose culture and outlook on life has taken the world of linguistics by storm. (STUDY GUIDE AVAILABLE)