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This guide outlines how to plant a garden even if you don't have a yard!

$5 - $10 per student Ages 8 - adult 1 to 4 weeks
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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