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On-air challenge: Every answer is a two-word phrase in which the letter "O" is added at the end of the first word to make the second word. For example, given the clue "pack animal owned by Thomas Jefferson's first vice president," the answer would be "Burr burro."
Last week's challenge: Draw a regular hexagon and connect every pair of vertices except one. The pair you don't connect are not on opposite sides of the hexagon but along a shorter diagonal. How many triangles of any size are in this figure?
Answer: 82 triangles
Winner: John Wilson of Shoreview, Minn.
Next week's challenge: What specific and very unusual property do these five words have in common: school, half, cupboard, Wednesday and friend? Identify the property and name a sixth word that shares the property. Any word having this property will be counted correct.
If you know the answer to next week's challenge, submit it here. Listeners who submit correct answers win a chance to play the on-air puzzle. Important: Include a phone number where we can reach you Thursday at 3 p.m. ET.