Rohan's apartment was a graveyard of half-built dreams.In the bedroom, a guitar with three strings—he'd learned the intro to "Wonderwall" and called it a day. In the hallway, a half-painted mural of a phoenix that looked more like a depressed chicken. His closet held running shoes for a marathon he'd trained for exactly one morning, a chess board mid-match (move fourteen, white to play), and a vegan cookbook with only the first recipe dog-eared."I'm a polymath," he told his dates. His mother called it something else: "The inability to sit still."Last Tuesday, it was day trading. He bought three courses,