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In this activity (on page 2 of PDF), learners create a low-tech refrigerator that requires no electricity to keep food from spoiling.

$1 - $5 per student Ages 8 - 18 1 to 2 hours
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In this activity about human interface design issues, learners help the Oompa-Loompas of a great chocolate factory solve different problems.

free Ages 8 - 18 1 to 2 hours