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In this math lesson, learners explore the concept of using units to measure length. Learners first read "How Big is a Foot" by Rolf Myller and learn about units.

$5 - $10 per group Ages 4 - 6 45 to 60 minutes
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In this activity (on pages 18-28), learners explore how the shape of seeds affects how they are dispersed by wind, birds, ocean currents and other means.

$5 - $10 per group Ages 8 - 14 1 to 2 hours