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In this activity, learners play a card game that explores the relative sizes of various objects. Learners compete to organize their hand of cards into lists of objects from largest to smallest.

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.

In this activity, learners explore the relative size of the Sun and Earth as well as the distance between them.

In this activity, learners make their own pinhole viewer in order to measure the size of the sun.

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).

In this activity, learners play a card game that explores different size scales--macro, micro and nano.

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

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

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 discover that a material can act differently when it's nanometer-sized.

In this activity, learners will participate in a scavenger hunt involving sizes, shapes, and numbers. This activity works well with a whole group, individuals, or families.

This is a hands-on activity exploring how nanoscale particles are used in mineral sunblocks to increase their transparency.

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.

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

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

Put the math of measurement, numbers, and everyday life into improvisational skits.

In this activity, learners follow clues to find five puzzle pieces, then assemble them. This activity works well with a whole group, individuals, or families.

Things that are different sizes and stiffness vibrate differently, and in this Exploratorium Science Snack, you'll see how rings of various diameters react to vibration and external forces.

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

By making models of light waves with paper, learners can understand why different colors appear in bubbles.