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

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

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

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