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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, learners use a fictitious map of "Tourist Town" and counters to problem solve how to place ice-cream vans on street intersections so that every other intersection is connected to one

In this web-based activity, learners try to figure out who in an online chat room has their matching puzzle piece.