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

Learners smell balloons filled with different scents to guess what's inside. From this, they infer the presence and motion of scented molecules.

In this activity, learners explore how hot and cold water move. Learners observe that temperature and density affect how liquids rise and fall.

In this story time program, young learners listen to the Dr.