Like the vitamin D, you can synthesize the happiness
Source: http://www.ted.com/talks/lang/eng/dan_gilbert_asks_why_are_we_happy.html
Youtube mirror: http://www.youtube.com/watch?v=LTO_dZUvbJA
Another increidible talk of the same author is this:
Dan Gilbert on our mistaken expectations
Source: http://www.ted.com/talks/lang/eng/dan_gilbert_researches_happiness.html
Youtube mirror: http://www.youtube.com/watch?v=c-4flnuxNV4
