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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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    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