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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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This is a classic exercise for visualizing the scale of the Solar System.

1 cent - $1 per group Ages 6 - adult 45 to 60 minutes
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In this geography investigation, learners use a nighttime satellite image to observe areas of light across the United States and to identify patterns and spatial distributions of human settlements.

1 cent - $1 per group Ages 8 - 14 1 to 2 hours