As one writer and radio reporter discovered, crossword puzzles tap the most obsessive side of the human brain--taking some players to dark places.

Today's special guest on the Morning Media Menu was Dean Olsher, a 30-year veteran of radio who has worked everywhere from NPR to Sirius Satellite Radio. He discussed his new book, "From Square One: A Meditation, with Digressions, on Crosswords."

During the discussion, Olsher shared tips for aspiring radio journalists. Here's an excerpt from the interview: "It's definitely an obsessive behavior, and addictive in the literal sense ... Along the way in my research I met a homeless guy in New York City who bought the NY Post and the NY Daily News every day with change he'd begged--just so he could do the crossword."