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In this activity, learners investigate diffusion by creating underwater "fireworks" using food coloring, oil and water.

Heat makes some materials expand, and it makes others shrink.

In this quick activity, learners break the tension that happens when water develops a "skin." Learners use water, pepper and some soap to discover the wonders of surface tension—the force that attract

In this activity, learners create a biosphere in a baggie.