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In this activity (on page 5 of PDF), learners use dry ice and household materials to make scientifically accurate models of comets.

$5 - $10 per group Ages 6 - adult 10 to 30 minutes
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In this activity, learners construct hail-proof houses using recycled materials to discuss storm readiness and safety.

$5 - $10 per group Ages 6 - adult 30 to 45 minutes
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Water treatment on a large scale enables the supply of clean drinking water to communities.

$5 - $10 per group Ages 11 - adult 45 to 60 minutes