Like many entrepreneurs, Ryan Blair had no formal business education. But he had great survival instincts, tenacity, and, above all, a "nothing to lose" mindset. His middle-class childhood ended abruptly when his abusive father succumbed to drug addiction and abandoned the family. Blair and his mother moved to a rough neighborhood, and soon he was in and out of juvenile detention, joining a gang just to survive. Then his mother fell in love with a...