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

In this outdoor, sunny day activity, learners experiment with paper leaf models to discover how some desert plants conserve water.

In this activity, learners make scale models of the Sun and Earth out of paper mache.

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

This paper describes a working-model demonstration of Ernest Rutherford's 1911 experiment about the nature of atoms.

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

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

In this activity (on pages 20-23 of PDF), learners build a model of a power plant using simple materials.

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.

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

In this activity, learners create a working model of a nail clipper. This activity helps learners learn the basic principles of simple machines, engineering design and model building.

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

In this activity, learners make balloon models of disease-causing bacteria.

In this activity, learners explore the relative sizes and distances of objects in the solar system.