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Make a model city happier with LEDs, circuits, motors, and batteries! Groups can think, discuss, design, and build what would make a community happy. Kids can work as part of a team or on their own.

In this activity, learners will make their own "ball bearing" with two jar lids, marbles, and some household supplies.

What's a more compelling problem to solve than being stranded on a deserted island?

Build and test a scale model of a rainforest canopy walkway.