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In this activity, learners make an optical illusion toy from the 1800s to explore persistence of vision.

In this design challenge activity, learners add a jet-propulsion system (i.e. a balloon) to a blimp so it flies straight and far under its own power.

In this challenge, learners make a helium balloon hover in one spot and then move it through an obstacle course using air currents.

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.