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In this activity, learners create a model of a hot air balloon using tissue paper and a hairdryer. Educators can use this activity to introduce learners to density and its role in why things float.

$5 - $10 per group Ages 6 - 14 1 to 2 hours
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In this activity, learners calculate the percentage of oxygen in the atmosphere by using steel wool's ability to rust.

1 cent - $1 per student Ages 11 - 18 1 to 7 days
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As a model of acid rain, learners water plants with three different solutions: water only, vinegar only, vinegar-water mixture.

$10 - $20 per group Ages 8 - 14 1 to 4 weeks
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In this activity, learners make different shapes that hold exactly one mole of gas (air).

$1 - $5 per group Ages 14 - 18 30 to 45 minutes
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In this activity about weights and balances, learners create their own balance using paper cups. Then, learners explore how to compare the relative mass of objects.

1 cent - $1 per student Ages 8 - 11 10 to 30 minutes
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This experiment allows learners to experience a small scale "epidemic," demonstrating the ease with which disease organisms are spread, and enables learners to determine the originator of the "epidemi

Over $20 per group Ages 14 - adult 4 to 24 hours