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In this optics activity, learners examine how polarized light can reveal stress patterns in clear plastic.

$5 - $10 per group Ages 8 - 18 5 to 10 minutes
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In this activity (on pages 25-31 of PDF), learners soak sponges with different amounts of plaster of paris to simulate different levels of calcification in bone formation.

$1 - $5 per student Ages 8 - 14 1 to 7 days