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In this activity, learners build water-propelled engines from soft drink cans.

In this design challenge activity, learners build a machine out of cardboard that runs smoothly and dependably. Learners must be precise to make sure their component works properly.

In this activity, learners are challenged to design and construct a windmill to harness the power of wind.

In this design challenge activity, learners build a rubber band-powered rover that can scramble across the room.

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.

Learners construct a rocket from a balloon propelled along a guide string.

In this activity, learners build small animated toys that move.

In this project, students explore how levers work, by making a puppet with moving limbs.

In this design challenge, learners build a boat that paddles itself using a rubber band as its power source.

In this design challenge, learners will create their own roller coaster using household objects for the track and a marble or small ball as their cart.

In this activity, learners build a bird that flies in place with help from a motor, wire, and some straws.

In this design challenge activity, learners build a shock-absorbing system that will protect two “astronauts” when they land.