Dan Gilbert 1: The surprising science of happiness

TED 2004 
Dan Gilbert: The surprising science of happiness  (script)
summary
The surprising science of happiness the speaker suggests is that we can synthesize happiness, because we have a "psychological immune system" which works under unconscious cognitive processes. It helps us change our views of  the world, in order to we can feel our world better.
However, we think happiness is a thing to be found, because we believe that natural happiness values rather than synthetic happiness.
Natural happiness comes to us when we got what we want. We synthesize happiness when we didn't get what we wanted. We have a strong belief that it is not good for our society  to synthesize happiness.
It is because it seems  the human brain has nearly tripled in mass in two million years. The evolved frontal cortex a pre- frontal cortex of which became to do an experience simulator.
Synthesize happiness is as same as what you naturally get something you want though it's distracted by the experience simulator. When you feel free to choose something, change and make up your mind, it works and it leads to overrating, thus  you are worried and chasing  other thing anytime after you choose experience. Despite we can synthesize happiness.
Words in this story
synthesize /verb/ unify, combined, mix. synthesis /noun/  synthetic /adj/
overrated / overplay, overprize, overvalue, overestimate
simulator / fake, pretender.