Over the years, Julianne Holt-Lunstad has fielded many requests from startups looking for her help. These entrepreneurs came to the Brigham Young University professor with the well-meaning goal of “solving” loneliness; they believed their app or company could help consumers build genuine connections, and wanted Holt-Lunstad’s opinion on this feature or that business tactic.  Across the pond, University College London professor Noreena Hertz was getting the same calls. They wanted her to join their boards, to advise them, to give their proof of concept a stamp of approval.  “Of the m...