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In this activity, learners create a "Jam Jar Jet" based on Francois Reynst's discovery of a pulsejet engine, which uses one opening for both air intake and exhaust.

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.

This design challenge is an open-ended exploration of linkages, a group of parts connected by hinges, and the types of motion they can create.

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