New on SI: Everything Andrew Luck Was, Is and Will Be

He stunned the NFL when he announced his retirement at age 29, just weeks before the start of the regular season. Everyone knows Andrew Luck was one of the sport’s most cerebral stars. But conversations with those who know him from endeavors off the field—authors, academics, architects—paint a fuller picture of a man who is, and always was, fascinated by many things outside the sport that made him famous.