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

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.

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.

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