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“When I was 5 years old, my mother always told me that happiness was the key to life. When I went to school, they asked me what I wanted to be when I grew up. I wrote down ‘happy’. They told me I didn’t understand the assignment, and I told them they didn’t understand life.” ― John Lennon

From the TED http://www.ted.com/playlists/4/what_makes_us_happy.html

http://www.social-consciousness.com/2013/10/ten-simple-things-you-can-do-today-that-will-make-you-happier-backed-by-science.html

http://topdocumentaryfilms.com/philosophy-guide-to-happiness/