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Battling for Oxygen
Working in groups, learners model the continuous destruction and creation of ozone (O3) molecules, which occur in the ozone layer.

Exploring Forces: Gravity
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In this nanoscience activity, learners discover that it's easy to pour water out of a regular-sized cup, but not out of a miniature cup.

Shake and Make: Charge Recognition
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In this activity (page 10), learners explore how molecules self-assemble according to forces of attraction and repulsion.