Puzzle master Will Shortz quizzes one of our listeners, and has a challenge for everyone at home.
Challenge from March 5: From Henry Hook, of Brooklyn, New York: What eight-letter noun -- containing the letter "B" -- is pluralized by inserting an "S" immediately before the "B"?
Answer: Passerby. You pluralize it by adding "S" to make "passersby."
Winner: Margo Porras, from San Diego, Calif.
Challenge from March 12: Name an object in four letters, starting with the letter "P." Change the "P" to a "B" and you'll get a verb that names something you do with that object.