Kimberly Moffitt, assistant professor of American Studies, and Michelle Scott, associate professor of history, were guests on the “Marc Steiner Show” on Monday to discuss the case of Trayvon Martin, a young African American man who was killed by a neighborhood watchman in February. The conversation turned to the role and perception of black men in society, and Moffitt related the incident to her worries for her own son. “There has been a study done that shows that, really interestingly, for young, African-descended boys in this country, around the age of 8 or 9 there’s a shift that happens where …