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    NSBRI
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    In this activity (on page 146 of the PDF), learners will explore the effects of increased carbon dioxide in the bloodstream. This activity can be enhanced by sharing the "Astronaut's...

    1 cent - $1 per group Ages 8 - 18 45 to 60 minutes
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    BioEd
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    In this environmental health activity, learners investigate their breathing and pulse rates, and learn how these measurements are affected by physical activity. There are three parts to this...

    1 cent - $1 per group Ages 8 - 14 1 to 2 hours
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    NASA
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    In this activity (on page 142 of the PDF), learners will compare breathing rates before and after hyperventilation to explore how reduced carbon dioxide levels in the blood lower the need to...

    1 cent - $1 per group Ages 8 - 18 45 to 60 minutes
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    Lawrence Hall of Science
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    In this outdoor winter activity, learners search for and create hibernation sites that will protect gelatin "animals" from freezing. Learners come to understand that hibernating animals...

    $1 - $5 per group Ages 6 - 14 45 to 60 minutes