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.

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All Stories by Zach Wissner-Gross
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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.