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

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.