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In this environmental health activity, learners investigate their own vital lung capacities.

$1 - $5 per group Ages 8 - 14 1 to 2 hours
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In this activity (page 26 of the PDF), learners make observations, formulate hypotheses and design a controlled experiment, based on the reaction of carbon dioxide with calcium hydroxide.

$5 - $10 per group Ages 8 - 18 1 to 7 days