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In this activity, learners create a mind and math puzzle that requires a three-dimensional solution.

In this activity (on pages 15-18 of PDF), learners make a life-size two-dimensional paper model of their own skeletons.

In this activity, learners construct three math puzzles out of simple materials like wood, string, and Styrofoam.

This activity about cryptographic techniques illustrates how to accomplish a simple, but nevertheless seemingly impossible task—making a fair, random choice by flipping a coin between two people who d