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In this activity, learners discover how to determine the distance to a lightning strike or nearby thunderstorm.

free Ages 6 - 14 5 to 10 minutes
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In this activity on page 7 of the PDF (Plants—The Green Machines), learners examine the effects that light and air have on green plants.

$1 - $5 per student Ages 6 - 11 1 to 4 weeks
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In this activity, learners use a flashlight, a glass of water, and some milk to examine why the sky is blue and sunsets are red.

1 cent - $1 per group Ages 11 - 18 5 to 10 minutes
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In this sunny day experiment, learners measure and compare how quickly light and dark colored materials absorb heat.

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