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In this activity, learners build penetrometers to test leaf toughness. Biologists measure leaf toughness to study the feeding preferences of insects and bugs.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes
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In this activity on page 7 of the PDF, learners explore how engineers characterize building materials.

$1 - $5 per student Ages 8 - 14 10 to 30 minutes