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In this activity, learners separate materials based on their special properties to mimic the way recyclables are sorted at recycling centers.

$1 - $5 per student Ages 6 - 11 10 to 30 minutes
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Using a vertical wind tube and using simple materials, individuals and groups attempt to design a "satellite" that floats for at least 5 seconds.

$1 - $5 per student Ages 4 - adult 30 to 45 minutes
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In this activity, learners build a hovercraft using a paper plate, cup, and simple motor.

$1 - $5 per student Ages 6 - 14 45 to 60 minutes