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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.

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

Using pipe cleaners, straws, and beads, learners explore the building blocks of life by creating their own model of DNA.

In this activity, learners interact with a 3-D model of a watershed to better understand the interconnectedness of terrestrial and aquatic environments.

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

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.

In this activity, learners construct models of plants that are adapted to living under specific environmental conditions.

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

In this activity, learners create a large film of soap and experiment with what can and cannot pass through it.

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

In this activity, learners explore dinosaur skeletons and anatomy. Learners make observations about a T. rex skeleton diagram and then measure the skeleton length and width.

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.

In this activity, learners solidify their conceptualization of cells by building a model of a cell in a ziplock bag.

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.