Will Shortz

On-air challenge: Every answer is a familiar two-word phrase or name in which the first word starts SI and the second word starts with T. For example, given "unadorned set of facts," you would say, "simple truth."

Last week's challenge: Name a movie in two words — five letters in each word. Both words start with vowels. Take one letter in the first word, move it two spaces later in the alphabet, and rearrange the result. You'll get the second word in the movie's title. What movie is it?

Answer: After Earth

On-air challenge: Categories are given based on the name "Homer," the name of a town in Alaska. Name something in the category beginning with each of the letters H-O-M-E-R. For example, if the category were "Chemical Elements," you might say Helium, Oxygen, Magnesium, Einsteinium, and Radon. You can give the answers in any order.

On-air challenge: Every answer is a made-up two-word phrase in which the letter I is inserted somewhere inside the first word to get the second word.

Last week's challenge: Think of a word starting with G. Change the G to a T and rearrange the letters after the T. The result will be a new word with the same meaning as the original word.

Answer: Giant; titan

Winner: Bonnie Kind of Germantown, Md.

On-air challenge: Today's theme is "C.S.I." — as in the name of the long-running TV show. You're given three words starting with the letters C, S and I. For each set, give a fourth word that can follow each of the original words to complete a compound word or a familiar two-word phrase.

On-air challenge: Every answer is a familiar two-word phrase or name in which the first word starts with H-A and the second word starts with T.

Last week's challenge: From listener Al Gori of Cozy Lake, N.J. Name a famous American man — first and last names. Change the first letter of his first name from T to H. The result will sound like a term for an attractive person. Who is it?

Answer: Ted Turner; head turner

Winner: Vernon Cole, Brownsboro, Ala.