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In this activity (on pages 4-5), learners make fake snow by adding water to the super-absorbant chemical from diapers, sodium polyacrylate.

The Sacred Cenote at Chichén Itzá is a sink hole, or well, containing groundwater. In this activity, learners create their own cenote using chalk, limestone, acids, and rain water.

In this activity, learners explore and compare the buoyant properties of materials found in nature and in human-made materials.

In this physics activity, learners will explore buoyancy.

In this activity, learners make a model of a one-way heart valve to investigate how a heart controls the direction of blood flow.