More people are going to college than ever before, but a lot of them aren't finishing. Low-income students, in particular, struggle to get to graduation. Only 9 percent complete a bachelor's degree by age 24. Why are so many students quitting, and what leads a few to beat the odds and make it through? In this documentary, American RadioWorks correspondent Emily Hanford introduces us to young people trying to break into the middle class, teachers trying to increase their chances and researchers investigating the nature of persistence.