For the past 20 years, Leonard's been asking tough, insightful questions on his show. But today, he turns the reins over to veteran broadcaster Tom Brokaw, and takes a turn answering questions for a change. Next, translator Gregory Rabassa pays tribute to the literary contributions Clarisse Lispector made to Brazilian writing. Then, director Chris Wedge joins us for a look at his latest animated flick, "Robots." Finally, on our regular Friday feature, Please Explain, we'll start preparing for spring by finding out the best ways to get things really clean.