Katherine submitted the puzzle for this week’s Numberplay at the New York Times Puzzle Blog, a lovely puzzle in honor of Avoid Triangles At All Costs (ATAAC) Day. So…

1. Check it out here!
2. Comment! We (and the people in charge of the NYTimes Blog) are trying to encourage non-experts to participate more in the commenting and mulling over of puzzles on their page. So take a look, and add a comment with something less than the entire solution. The more we do this, the more we create a welcoming environment for puzzlers to get engaged.
3. Tell your friends!