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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.

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.

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.

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.

A Closer Look at Crystals
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In this activity, learners compare different types of salt crystals under a magnifying glass.

Ready, Set, Fizz!
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In this activity, learners explore the chemical reaction between water and effervescent antacid tablets. This hands-on activity models how a material can act differently when it's nanometer-sized.

Exploring Properties: Surface Area
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This hands-on activity demonstrates how a material can act differently when it's nanometer-sized.

Balloon Car
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In this activity, learners explore force and motion by constructing cardboard cars that are propelled by balloons.

Air Cannon
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In this activity (page 1 of PDF under SciGirls Activity: Forecasting), learners will construct an air cannon by cutting a hole in the bottom of a bucket and stretching a garbage bag over the other end

How Big is Small
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In this classic hands-on activity, learners estimate the length of a molecule by floating a fatty acid (oleic acid) on water.

Above Water: Buoyancy & Displacement
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In an investigation called "Shape It!" learners craft tiny boats out of clay, set them afloat on water and then add weight loads to them, in order to explore: how objects stay afloat in water; what th

Size and Scale: Probing and Predicting
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In this quick activity about predicting (located on page 2 of the PDF under Where's Nano?

Sugar Crystal Challenge
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This lesson focuses on surface area and how the shape of sugar crystals may differ as they are grown from sugars of different coarseness.

Fizzy Nano Challenge
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This lesson focuses on how materials behave differently as their surface area increases.

Building Tall
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In this engineering activity (page 2 of PDF), young learners investigate how a wide base can make a building more stable. Learners use blocks or boxes of different sizes to construct stable towers.