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Size Wheel
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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).

Comparing Sizes of Microorganisms
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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

Invisible Sunblock
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In this activity, learners find out why some mineral sunblock rubs in clear. Learners compare nano and non-nano sunblocks and discover how particle size affects visibility.

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

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.

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

Resonant Rings
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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.

Oboe? Oh, Boy!
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In this activity, learners create a straw oboe to explore sound and pitch.

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.

Paper Chromatography with Leaves
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In this activity on page 5 of the PDF (Plants—The Green Machines), learners use chromatography to separate and identify pigments within various leaves.

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.
Diffraction Between Wax Blocks
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In this optics activity, learners explore diffraction by adding wax blocks to a ripple tank. The wedge-shaped blocks act as obstacles that the wave must bend around.

Pinhole Magnifier
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In this activity related to light and perception, learners use a pinhole in an index card as a magnifying glass to help their eye focus on a nearby object.

Special Effects: Titanic and Beyond
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In this activity, learners investigate how geometry plays a role in perspective.

Super Sleuths
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In this physical sciences activity, learners use science to solve a "crime." Learners collect trace evidence (glitter) and explore its characteristics, such as color, size, shape, and light reflection

Beam Me Up!
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This is a quick activity (on page 2 of the PDF under Stained Glass Activity) about the "Tyndall effect," the scattering of visible light when it hits very small dispersed particles.

Transit Tracks
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In this space science activity, learners explore transits and the conditions when a transit may be seen.

Our Sense of Sight: How We Perceive Movement, Depth and Illusions
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In this activity, learners investigate visual perception as well as plan and conduct their own experiments.

Our Sense of Hearing
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In this activity, learners investigate the sense of hearing and plan and conduct their own experiments.

Catch a Wave: How Waves are Formed
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In this three-part activity, learners explore how waves are formed and why some waves are bigger than others. First, learners observe waves of water in a pan generated by an electric fan.