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Gieant Sieve Sorter
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This Exploratorium activity explores size and scale. Through four levels of screen sizes, learners can sort out objects of different sizes.

Sizing Up Hail
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In this activity, learners will estimate the sizes of balls to learn how to estimate the size of hail. Learners will compare their estimates to the estimates of their peers and the real measurements.

Strange Soap
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In this physics activity, learners experiment with soap bubbles to see what variables affect their size. They explore how soap film and bubbles always seek the smallest surface area possible.

Measure the Sun's Size
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In this activity, learners make their own pinhole viewer in order to measure the size of the sun.

Size and Distance
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In this activity about depth perception, learners create an optical illusion in a shoe box.

Pea Brain!: Explorations in Estimation
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In this activity, learners use two different techniques to estimate how many little things fit into one bigger thing.

Creating Craters
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In this activity, learners will investigate how craters are made and the different factors that contribute to size left from the impact.

Exploring at the Nanoscale
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This lesson focuses on how nanotechnology has impacted our society and how engineers have learned to explore the world at the nanoscale.

Does Size Make a Difference?
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In this activity on page 15 of the PDF, discover how materials and physical forces behave differently at the nanoscale.

Scale Models
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In this activity, learners explore the relative sizes and distances of objects in the solar system.

Finding the Size of the Sun and Moon
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In this activity, learners build a simple pinhole viewer. They use this apparatus to project images from a variety of light sources, including a candle, the Sun, and the Moon.

Separation Anxiety
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In this activity, learners discover the primary physical properties used to separate pure substances from mixtures.

Small Snails, Enormous Elephants
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This activity (located on page 2 of PDF) introduces learners to the real size of animals using nonstandard measurement.

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

Bubble Cups
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In this activity, learners will construct a device to blow bubbles. By adding corn syrup to the bubble solution, we can increase the surface tension of the bubbles--and their size.

Marshmallow Puff Tube
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In this demonstration/activity, learners observe as a regular size marshmallow is blown through a tube made from a manila file folder.

Hoopster: An Airplane Made from Paper Hoops
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This activity provides instructions for making an aircraft that can really fly using a straw and paper hoops!

Body Biographies
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In this activity, learners will learn about a person they admire (famous, family or otherwise) or even themselves and create a life-sized silhouette.

Sketch a Skeleton
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In this activity (on pages 15-18 of PDF), learners make a life-size two-dimensional paper model of their own skeletons.

Chromosome Models: Karyotyping
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This activity was designed for blind learners, but all types of learners can have a tactile opportunity to construct a karyotype, an organized model of an organism’s chromosomes, conveying the chromos