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In this activity, learners test the rate of ripening fruit and vegetables and use a chemical to inhibit the ripening process.

$10 - $20 per group Ages 8 - 14 1 to 2 hours
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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