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In this hands-on activity, learners use heat to shrink samples of polystyrene plastic (#6 recycle code). Learners compare the size and shape of the plastic pieces before and after shrinking.

1 cent - $1 per group Ages 6 - adult Under 5 minutes
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In this hands-on activity (on page 2 of the PDF), learners experiment with lemon juice and paper to create a message that can only be revealed using chemistry.

1 cent - $1 per student Ages 6 - 14 10 to 30 minutes
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In this activity, learners use chocolate to explore how the Sun transfers heat to the Earth through radiation.

1 cent - $1 per group Ages 6 - 14 10 to 30 minutes
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This activity about density provides instructions for making a miniature "lava lite" with just salt, oil, water, and food coloring.

1 cent - $1 per student Ages 4 - 8 10 to 30 minutes