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In this activity, learners actually feel the difference in energy required to light two different types of light bulbs: incandescent light and LEDs.

$5 - $10 per group Ages 8 - 14 5 to 10 minutes
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Learners experiment with a commercially available liquid-crystal coaster. They warm the material with their hands for varying lengths of time and observe the changing colors that result.

$5 - $10 per group Ages 4 - 14 5 to 10 minutes