On Tuesdays, KERA looks at education as part of its American Graduate initiative. Today we focus on Duncanville schools through the eyes of its relatively new superintendent. In the spring, Marc Smith came from Marshall, the district he ran since 2012. Duncanville, with 13,000 students, is twice as big and sits just south of Dallas. KERA’s Bill Zeeble travelled to the district office where Smith is creating new programs and partnerships he hopes will help Duncanville stand out.