David Steindl-Rast: Want to be happy? Be grateful https://www.ted.com/talks/david_steindl_rast_want_to_be_happy_be_grateful
Matthieu Ricard: The habits of happiness https://www.ted.com/talks/matthieu_ricard_on_the_habits_of_happiness
Dan Gilbert: The surprising science of happiness https://www.ted.com/talks/dan_gilbert_asks_why_are_we_happy