Zach Wissner-Gross

Zach Wissner-Gross is the creator of the weekly math puzzle newsletter Fiddler on the Proof and develops STEM curriculum at Amplify Education. Previously, he ran the math puzzle column The Riddler at FiveThirtyEight.

All Stories by Zach Wissner-Gross

  1. Math puzzle: A Loopy Holiday Gift Exchange

    Solve the math puzzle from our December 2025 issue, in which a holiday gift exchange occurs.

  2. Math puzzle: Can you meet me at the mall?

    Solve the math puzzle from our August 2025 issue, which takes you back to the time before cell phones.