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In this geology activity, learners create a model using a mixture of salt and sand inside a CD case. When the case is tilted or inverted, the mixture dramatically sorts into a layered pattern.

In this online activity, learners build their own system of heavenly bodies and watch the gravitational ballet.

In this activity, learners explore how engineering has developed various means to remove impurities from water.

In this activity, learners investigate convection by using food coloring and water of different temperatures.

In this activity, learners conduct a simple experiment to see how electrically charged things like plastic attract electrically neutral things like water.

In this activity, learners will explore how a hydrometer works by building a working model and conducting experiments.