Google I/O will take place May 20-21 The Google I/O date has been unveiled. It’s surprisingly a week later this year than usual. So we’re looking at May 20 and May 21. Typically, Google will ...

What is it? If you know the answer to the challenge, submit it below by Thursday, July 10 at 3 p.m. ET. Listeners whose answers are selected win a chance to play the on-air puzzle.

I've been at the 185th convention of the National Puzzlers' League, which has been taking place in Minneapolis. I've brought a puzzle by someone else who was there -- Ben Bass, of Chicago.