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By making models of light waves with paper, learners can understand why different colors appear in bubbles.

1 cent - $1 per student Ages 11 - 18 10 to 30 minutes
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Teams of learners use a series of stick figures made from pipe cleaners to model a dance routine. Then, they use this model to communicate to another learner who performs the dance routine.

1 cent - $1 per group Ages 8 - 11 10 to 30 minutes
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In this online game, learners run an outer space drink stand and thirsty alien customers are on the way.

free Ages 8 - 11 10 to 30 minutes
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In this quick activity about pollutants and groundwater (page 2 of PDF under Water Clean-up Activity), learners build a model well with a toilet paper tube.

$1 - $5 per group Ages 8 - 14 10 to 30 minutes