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This is a quick activity (on page 2 of the PDF under Gecko Feet Activity) about the forces of gravity and surface tension and how their behavior is influenced by size.

This is an activity (located on page 4 of the PDF under What's Nano? Activity) about size and scale.

This is an activity (located on page 4 of the PDF under Surface Area Activity) about surface area and reactivity.

This is a quick activity (on page 2 of the PDF under Stained Glass Activity) about the "Tyndall effect," the scattering of visible light when it hits very small dispersed particles.