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In this lesson, learners cut paper into very small pieces to explore the small size of quarks, the smallest thing we know of on Earth.

In this activity, learners observe mixtures of sand samples glued to note cards, and consider how sand can differ in size, shape, and color, and where it comes from.

This is a quick activity (on page 2 of the PDF under Gecko Feet Activity) about the forces of gravity and surface tension and how their behavior is influenced by size.

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

In this activity, learners develop an understanding of cylinders and volume as they compare two sizes of popcorn buckets.

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

In this activity, learners will observe how air interacts with a paper helicopter. Learners will test different variables of weight, size, and shape.

In this activity, learners cut a shape into two equal sized pieces and use their knowledge of geometry and space to prove that the two parts are equal.

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.

Learners investigate how drag affects the falling rate of objects.

In this physics activity, learners explore how sound is created by vibrations.

In this activity, learners conduct a simple test to find their blind spot.

In this activity, learners control the (apparent) size of a hole with their brain.

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 create a straw oboe to explore sound and pitch.

These three short activities challenge groups to fit objects through paper and index cards: "Slots" presents the challenge for one learner to figure out which objects fit through a hole cut by another

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

In this activity, learners explore fractions as they help gators share pies.

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.

In this activity, learners engineer a flying glider using paper hoops and a drinking straw.