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In this engineering challenge, learners design and build a crane out of cardboard to see how heavy a load it can lift.

In this design challenge activity, learners modify a cup so it can carry a marble down a zip line and also drop it onto a target.

Learners build simple catapults and use them to launch cotton balls.

In this activity, learners explore the concept of friction and how ball bearings reduce friction.

In this activity, learners model directed evolution by making paper fly. Learners construct and fly paper airplanes.