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Life Size: Line 'em up!
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In this activity on page 1 of the PDF, learners compare the relative sizes of biological objects (like DNA and bacteria) that can't be seen by the naked eye.

Size Wheel
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In this fun sticker activity, learners will create a size wheel with images of objects of different size, from macroscopic scale (like an ant) to nanoscale (like DNA).

Estimation
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In this online activity, learners will explore size estimation in one, two and three dimensions. Multiple levels of difficulty allow for progressive skill improvement.

Life Size: What's in a microbe?
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In this activity on page 3 of the PDF, learners visualize the relative size and structural differences between microbes that have the potential to cause disease.

The Thousand-Yard Model
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This is a classic exercise for visualizing the scale of the Solar System.

Soap-Film Interference Model: Get on our wavelength!
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By making models of light waves with paper, learners can understand why different colors appear in bubbles.

Pi Graph
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In this activity, learners use a straight line to learn about circles. Learners measure and record the diameter and circumference of different sized cylindrical objects on a chart.

Mapping the Classroom
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In this activity, learners discover the importance of maps and scale as they work together to create a map of the classroom.

Earth Walk
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In this hands-on and feet-on excursion, learners take a science walk to visualize the planet's immense size and numerous structures, without the usual scale and ratio dimensions found in most textbook

Sizing Up Temperature
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In this activity, learners explore Charles' Law in a syringe.

Using Different Models of Earth
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In this activity, learners explore how the shapes, sizes, and distances of land masses appear differently on two different models of Earth: an icosahedron and a flat map.

Transit Tracks
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In this space science activity, learners explore transits and the conditions when a transit may be seen.

Our Sense of Sight: How We Perceive Movement, Depth and Illusions
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In this activity, learners investigate visual perception as well as plan and conduct their own experiments.