If you've ridden the subway in the past eight months, you know Garvin Gittens. You've seen the posters of him seated on a stoop, elbows on his knees, gazing over the hordes of commuters. Maybe you've even read the text floating next to him: "I saw an ad on TV for a two-year school where I could learn graphic design and threw away $25,000 on a... More >>>