On any given day, much of our communication is with people we don't know, or don't know well. Those interactions can sometimes be fraught with misunderstandings and misreading. Author, podcaster, and thought experimentalist Malcolm Gladwell has taken this idea and run with it in his first book in six years, "Talking to Strangers: What We Should Know About the People We Don't Know." Gladwell lays out social science research, applies it to current events and asks readers to rethink anything from police checks to Amanda Knox, Bernie Madoff, campus sexual assault, and terrorist interrogations. He talks to Steve Paikin about why we can't trust what we think we know when we meet unfamiliar people.