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

$1 - $5 per student Ages 6 - 11 5 to 10 minutes
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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.

$5 - $10 per group Ages 8 - 14 45 to 60 minutes
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In this challenge, learners make a helium balloon hover in one spot and then move it through an obstacle course using air currents.

$1 - $5 per student Ages 8 - 14 10 to 30 minutes
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In this design challenge activity, learners add headphones to a previously built instrument (see "Build a Band" activity) to make it easier to hear.

$5 - $10 per student Ages 8 - 14 45 to 60 minutes
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In this design challenge activity, learners invent an emergency shelter that can fit a person and is sturdy and quick to build.

$10 - $20 per group Ages 8 - 14 30 to 45 minutes