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In this online Flash game, learners will captain a sailing challenge, adjusting boat direction and sails, seeking the way to take greatest advantage of varying wind speeds and directions to catch the

In this activity, learners create an electrical circuit and investigate how some dissolved substances conduct electricity.

In this design challenge activity, learners invent an emergency shelter that can fit a person and is sturdy and quick to build.

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