Por que somos felizes - Veja o TED com Dan Gilbert, um grande estudioso do tema.

Dan Gilbert asks, Why are we happy? | Video on TED.com

http://www.ted.com/talks/dan_gilbert_ask...

TED Talks Dan Gilbert, author of Stumbling on Happiness, challenges the idea that we’ll be miserable if we don’t get what we want. Our "psychological immune system" lets us feel truly happy even when things don’t go as planned.