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Are you a Square or a Rectangle?
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In this activity, learners investigate whether more people are squares or rectangles. People with similarly sized heights and arm spans are classified as squares.

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.

In Proportion
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Through this nutrition activity (page 5 of the PDF), learners will understand—and probably be surprised by—how big serving sizes of various foods should be.

Gummy Growth
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In this activity related to Archimedes' Principle, learners use water displacement to compare the volume of an expanded gummy bear with a gummy bear in its original condition.

How Big Were the Dinosaurs?
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In this activity (located on page 4 of PDF), learners gain insight into the actual size of dinosaurs and practice making estimations and measurements.

Membrane Permeability with Beets
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In this lab exercise, learners explore diffusion, cell membranes and particle size using beets and three alcohols.

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.

Building Blocks
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In this activity (page 32 of PDF), learners investigate the nutritional needs of healthy bones and muscles.

Size, Scale and Models
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In this activity, learners take measurements and create charts to learn about the size of dinosaurs and their relative scale to humans.

Line Up: Using Math To Stand In Line
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Put math of measurement into lining up — and make waiting in line fun. Choose a size characteristic that learners can physically compare, such as foot length or hair length.

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.

Pupil to Pupil
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In this quick and simple activity about reflexes (at the top of the webpage), learners conduct a simple test to explore pupillary response.

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.

Measuring Your Blind Spot
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In this activity, learners calculate the width (horizontal diameter) of the blind spot on their retina. Learners make a blind spot tester using a piece of notebook paper.

Exploring Size: Scented Balloons
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In this activity, learners use their sense of smell to explore the world on the nanoscale.
Wheel of Fitness
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In this fun activity for any size group, early elementary learners complete physical challenges while playing a game. Learners add new challenges to the "wheel of fitness" that they want to try.

Size It Up
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In this artistic activity, learners blow up a smaller picture into a larger one, by using a grid.

Lean, Mean Information Machine: Using a Simple Model to Learn about Chromosomal DNA
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Learners observe a model of a cell and its chromosomal DNA made from a plastic egg and dental floss. Use this model to illustrate how much DNA is held in one cell.

Super Sounding Drum
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In this activity, learners construct drums out of everyday containers (like bowls or food containers) and shrink wrap. Learners use a hair dryer to affix and tighten the shrink wrap to the container.