In recent years, cognitive scientists have turned in increasing numbers to the study of human happiness, and one of their central findings is that we are not very good at predicting how happy or unhappy something will make us. Given time, survivors of tragedies and traumas report themselves nearly as happy as they were before, and people who win the lottery or achieve lifelong dreams don't see any long-term increase in happiness. ... They compared the self-reported happiness levels of lottery winners, paralyzed accident victims (both paraplegics and quadriplegics), and people who were neither. What they found was that lottery winners didn't report themselves appreciably happier than the control group, and while the paralyzed did report themselves less happy than the controls, the difference was not as dramatic as the researchers had expected. More recent and rigorous studies have yielded results broadly similar.