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In this fun physics activity (page 9 of the pdf), learners take part in a paper airplane design challenge.

1 cent - $1 per student Ages 6 - 11 10 to 30 minutes
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When baseball was in its infancy, the ball had plenty of bounce. Today's baseball may not seem to have bounce to it at all; if you drop a ball on the field it won't bounce back.

1 cent - $1 per group Ages 8 - 18 10 to 30 minutes