The document discusses the human prefrontal cortex and its ability to simulate experiences. It notes that while people expect winning the lottery to result in long-term happiness, studies show lottery winners and paraplegics are equally happy after 1 year due to impact bias overestimating future events' effects. Happiness can be synthesized through changing one's views, and synthetic happiness is as good as achieved happiness according to experiments. While synthetic happiness seems unnatural, changing one's views is effective. The document advises synthesizing happiness when truly stuck without options, and notes problems arise when preferences drive too hard or fast by overrating differences between futures.