When “Lost” returns to ABC tonight, among its most ardent viewers will be 21 students at Tufts University. That’s because they’re taking a course (for credit!) about the show. Today on my show, I talked with instructor Chadwick Matlin about what they cover in the class, which questions he wants the show to answer, and more. Listen, then check out the syllabus for the “Lost” class at Tufts.