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Learners investigate the concept of humidity by using a dry and wet sponge as a model. They determine a model for 100% humidity, a sponge saturated with water.

In this detailed activity (on pages 9-18), learners investigate the body parts of a parasitic ascaris worm by making and dissecting clay models.

Make a big canvas of iridescent color with pvc pipe! In this Exploratorium Science Snack, you'll need to cut and assemble some PVC pipe, but the pay-off, the soap-bubble canvas, is big.

By making models of light waves with paper, learners can understand why different colors appear in bubbles.

In this activity, learners imitate the way vocal cords work by building a model from a plastic cup, rubber band, and a straw.

Learners build a model of a pollution control device--a cyclone. A cyclone works by whirling the polluted air in a circle and accumulating particles on the edges of the container.

Learners will build a homemade pump using a balloon, a mason jar, and some straws.

Learners will construct a model of a heart valve using a film canister, a piece of masking tape, and a piece of paper.

By building a model of a lung and diaphragm, learners discover the function of various parts of the body's respiratory system.