Derrius Quarles leans back in his seat and methodically analyzes Aristotle's theory of truth during freshman honors English class at Morehouse College. He strides across campus in a navy blue tailored suit and a bold red sweater handing out business cards that boast "Student/Entrepreneur/Leader." But behind the 19-year-old's dauntless appearance is a past that few on campus know. When Quarles was 5, the state took him away from his mother. He spent his childhood bouncing from home to home before ending up on his own at 17 in an apartment on Chicago's South Side. His arrival at a prestigious, historically...