Puzzle master Will Shortz quizzes one of our listeners, and has a challenge for everyone at home.
Challenge from December 17: Think of a five-letter word starting with T. It's plural. Add an S at the end, and you'll get a six-letter word that is also plural. What words are these?
Answer: These and Theses
Winner: Brian Schnittker of Plano, Texas
Challenge from December 24: From listener Stuart Parker of Durham, New Hampshire: Think of two words, one starting with O, the other starting with R. Both end with ING, and they have the same number of letters. In one sense the words are synonyms and in another sense they're antonyms. What are the words?