Sometimes a psychological phenomenon becomes so well-known that even people with no training whatsoever in psychology are familiar with it. That’s true for the five stages of grief, as described by the psychiatrist Elisabeth Kubler-Ross back in 1969. When someone dies, she suggested, the first reaction of the loved ones left behind is denial . Anger comes next, then bargaining , then depression . Finally, after all those stages have passed, mourners experience some acceptance of their loss. Originally, Kubler-Ross formulated the stages of grief to describe the reactions of patients who had terminal illnesses. But she never conducted a systematic study of people’s reactions to the death of a loved one, and whether those reactions change over time in the way she predicted. Over the years, researchers have stepped in to try to see whether Kubler-Ross was right. They found that, with regard to the order in which various reactions peak over time, Kubler-Ross was spot on....