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In this activity related to microbes, learners create scale models of microorganisms and compare relative sizes of common bacteria, viruses, fungi and protozoa using metric measures: meters, centimete

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

“Exploring the Solar System: Big Sun, Small Moon” is a hands-on activity that explores the concept of apparent size and allows visitors to experience this phenomena using familiar objects—a tennis bal

In this activity, learners investigate the concepts of relative size and distance by creating a basic model of the solar system.

In this quick activity about size and scale (on page 2 of the PDF under What's Nano?

In this activity, learners place cards featuring biological structures in order by their relative size from largest to smallest.

In this activity, learners use two different techniques to estimate how many little things fit into one bigger thing.

In this activity about scale, learners investigate the world of the very small by cutting a 28 centimeter strip of paper in half as many times as they can.

In this activity, learners shrink the scale of the vast solar system to the size of their neighborhood.

In this activity, learners "go fishing," then practice ruler use and size/pattern comparison with the animals they catch.

In this activity, learners investigate just how small a billionth of a meter is by attempting to cut a paper ruler down to a nanometer-sized sliver.

In this activity, learners model the gravitational fields of planets on a flexible surface.

In this activity, learners explore the size and scale of dinosaurs. Learners listen to "Dinosaurs, Dinosaurs" by Byron Barton to understand some background information about dinosaurs.

Build a house you can fit inside, using cardboard tubes.

In this activity (located on page 2 of PDF under GPS: Baby Dinosaurs Activity), learners will look for a relationship between skull size and body length among various dinosaurs.

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

In this demonstration, learners compare the relative sizes and masses of scale models of the planets as represented by fruits and other foods.

In this activity, learners will predict the size of a giant scale model of a comb or other rectangular object, then make one. If you tripled the size of a dollar bill, could you sit on it?

In this activity, learners dissect a piece of pizza to learn about nutrients important for health.

In this activity, learners discover that a material can act differently when it's nanometer-sized.