“When you’re nostalgic about something, there’s a little bit of a sense of loss—[the moment has] happened, it’s gone—but usually the net result is happiness,” says Clay Routledge, a social psychologist at North Dakota State University, who, with several other researchers, has studied the emotion extensively over the past decade. The team has found that nostalgic memories typically entail cherished, personal moments, such as those spent with loved ones. Those memories, in turn, inspire positive feelings of joy, high self-regard, belonging, and meaningfulness in life.