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Learners manipulate opaque, sealed boxes and attempt to determine their interior structures. Each box contains a moving ball and one or more fixed barriers.

In this outdoor activity/field trip, learners catch and observe water striders to explore their movement and feeding behaviors.

This is an activity (located on page 3 of the PDF under Nanosilver Activity) about diffusion of small molecules across cell membranes.

In this activity, learners explore color, light and shadow by creating their own puppets to hold in front of a light source.

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

This activity (on page 2 of the PDF under GEMS Activity) is a full inquiry investigation into technology design and testing.

In this activity (page 26 of the PDF), learners make observations, formulate hypotheses and design a controlled experiment, based on the reaction of carbon dioxide with calcium hydroxide.