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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.

In this activity (12th on the page), learners investigate their ability to discriminate (see) different colors.

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.

Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

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

In this yummy chemistry activity which requires adult supervision, learners use sugar and water to explore how crystals form.

In this physics activity, learners will explore buoyancy.

In this activity, learners examine photo images of Earth taken from space, and attempt to identify and explain some of our planet's geological features.

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