I would like to believe — and I hope you would too — that one day we will work out how to encourage long-lasting contentment in the brain. We're still slaves to our evolutionary roots, unfortunately. And evolution didn't have much interest in making us happy creatures. Perhaps with the right alterations, the right lifestyle, the right chemicals and cardio and cake, we'll kill whatever it is that keeps us perpetually racing after happiness, and actually make it a lasting condition.