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In this design challenge activity, learners use a balloon and other simple materials to design an air-powered rocket that can hit a distant target.

In this invention challenge activity, learners see how many objects they can grab with a homemade "bionic" arm.

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

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

In this design challenge activity, learners build a device to carry a Ping-Pong ball from the top of a zip line to the bottom in four seconds (or less!).

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

In this design challenge activity, learners build a car that can travel at least four feet using rubber band power and use the design process to debug problems.

In this design challenge activity follow up to "Kicking Machine", learners add a hands-free feature to their Kicking Machine.

In this design challenge activity, learners invent a way to send a Ping-Pong ball flying high enough to catch it - like football with a twist!

In this design challenge activity, learners build a machine that kicks a Ping-Pong ball into a cup lying on its side 12 inches away.