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In this activity, learners build their own construction cranes using tongue depressors and pushpins.

In this activity, learners consider how a simple machine, a lever, turns a small push or pull (a small force) into a larger--or stronger--push or pull (a larger force).

In this activity, learners explore accuracy and precision.

In this activity, learners explore trebuchet design. Teams of learners construct trebuchets from everyday materials.

In this activity, learners build a seesaw powered by magnets.

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