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

In this activity, learners construct bug models that "jitter" all over the table with just a battery, motor, and counterweight.

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 add headphones to a previously built instrument (see "Build a Band" activity) to make it easier to hear.

In this design challenge activity, learners invent an emergency shelter that can fit a person and is sturdy and quick to build.