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    In this math lesson, learners apply the concepts of ratio and proportion to the capture-recapture statistical procedure. Learners are given containers (the bay) and an unknown number of fish-shaped...

    $5 - $10 per group Ages 11 - 14 45 to 60 minutes
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    In this environmental science lesson, learners will examine the dangers of mercury and how humans contribute to growing mercury emissions on Earth. First, learners watch a NewsHour video segment...

    $5 - $10 per group Ages 14 - 18 1 to 2 hours