Cassette tapes? Sitcoms? The Challenger Explosion? This week, David Rullo and Valerie Christofel sit down with Melissa Lenos, University of Pittsburgh professor and co-author of "Generation X: The Culture that Defined the MTV Generation" to connect the dots between these moments, the media and other generation defining events. Oh, and maybe we'll settle the debate of when you have to be born to be considered Gen X.