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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 are challenged to design and build a miniature tree house in a potted plant. This activity uses engineering concepts to encourage creativity.

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

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.