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In this activity, learners make water-walking critters using thin wire, and then test how many paper clips these critters can carry without sinking.

$5 - $10 per group Ages 11 - 14 10 to 30 minutes
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In this activity (Page 22 of PDF), learners investigate the evolution of wheat by washing different types of dough with water and comparing the results.

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