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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.

This is a simple activity fully driven by imagination. Using materials from the home, toys, or items from nature, learners create their own world to play with.

In this online game, learners test their knowledge of human anatomy.

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.

In this activity, learners make a 3-D model of DNA using paper and toothpicks. While constructing this model, learners will explore the composition and structure of DNA.

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

In this activity, learners create a model using metric measuring tapes and atmosphere composition data.

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

Learners observe and discuss a vacuum cleaner as a model of a baghouse, a device used in cleaning industrial air pollution.

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

Educator Amy O'Donnell from the American Museum of Natural History guides learners to create a diorama of a coral reef.

In "Chemistry Makes Scents," participants use their noses to distinguish between chemicals with very similar structures.

In this quick activity about pollutants and groundwater (page 2 of PDF under Water Clean-up Activity), learners build a model well with a toilet paper tube.