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Learners test two jars containing hot water, one covered with plastic and one open, for changes in temperature.

1 cent - $1 per group Ages 8 - 14 10 to 30 minutes
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Learners test two jars of ice water, one covered and one open, for changes in temperature. After placing the jars in the sun, learners discover that the covered jar cools down more slowly.

1 cent - $1 per group Ages 8 - 14 10 to 30 minutes
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In this online interactive simulation, learners will test the pH of liquids like coffee, spit, and soap to determine whether each is acidic, basic, or neutral.

free Ages 11 - adult 10 to 30 minutes
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In this activity, learners simulate what happens to a human spine in space by making Sponge Spool Spines (alternating sponge pieces and spools threaded on a pipe cleaner).

$5 - $10 per group Ages 8 - 14 10 to 30 minutes
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This is a quick activity (on page 2 of the PDF under Stained Glass Activity) about the "Tyndall effect," the scattering of visible light when it hits very small dispersed particles.

$5 - $10 per group Ages 8 - 14 10 to 30 minutes
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In this activity (on page 5 of PDF), learners use dry ice and household materials to make scientifically accurate models of comets.

$5 - $10 per group Ages 6 - adult 10 to 30 minutes