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Why do men have nipples?

Emergency medicine physician Dr. Billy Goldberg and best-selling author and satirist Mark Leyner joined forces to answer the questions everyone wonders about but few are willing to ask out loud. The resulting book, "Why Do Men Have Nipples?" is receiving acclaim worldwide.  Leyner and Goldberg joined MSNBC.com's Will Femia on the phone to answer more such questions in this audio interview.