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In this engineering activity, learners test the stability of towers they build out of cups, discovering that structures with more mass in the base are more stable.

1 cent - $1 per student Ages 8 - 14 10 to 30 minutes
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In this activity about center of gravity (page 23 of PDF), learners investigate how the body adjusts to the force of gravity to remain balanced.

$1 - $5 per group Ages 6 - 11 1 to 2 hours