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This activity (on page 3 of the PDF under GPS: Baseball Activity) is a full inquiry investigation into how "bounciness" relates to the distance a ball will fly when hit off a batting tee.

$5 - $10 per group Ages 8 - 14 1 to 2 hours
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In this chemistry challenge, learners discover that many chemical reactions involve heat loss or gain.

$10 - $20 per group Ages 4 - 14 10 to 30 minutes