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Globe at Night
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In this international citizen science activity, learners measure their night sky brightness and submit their observations into an online database.

Why Are Bubbles So Colorful?
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In this activity, learners explore why they can see colors in bubbles and why they change.

Optical Morpher
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In this amazing activity about light and reflection, learners will use a pie plate and reflective strips from a mylar balloon to try to morph their face into a friend's.

Lagging Sound
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In this group activity, learners see and hear the speed of sound. A learner designated the "gonger" hits a gong, once every second, as the rest of the group watches and listens from a distance.

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.

Film Canister Farming
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In this hands-on botany activity, learners sprout vegetables in film canisters.

Mirror, Mirror on the Wall: Angles of Reflection
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In this optics activity, learners work in pairs to explore how mirrors work. Learners use tape to mark the angles needed to see each other's reflection in a wall mirror.

Easy PEAsy Seed Germination
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In this activity, learners determine the necessary conditions for pea seed germination.

Illuminating Luminescence
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In this activity, learners compare and contrast different forms of luminescence by observing how chemiluminescence, phosphorescence, and fluorescence produce or emit light.

Light Soda
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In this activity, learners sublimate dry ice and then taste the carbon dioxide gas.

Exploring Structures: Butterfly
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In this activity, learners investigate how some butterfly wings get their color.
Fish Eyes: More than Meets the Eye
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In this data collection and analysis activity, learners evaluate fish physiology and ecology using vision research data from Dr.

Bubble Tray
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In this activity, learners use simple materials to create giant bubbles.

Cylindrical Mirror
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In this activity, learners create a cylindrical mirror to see themselves as others see them.

Benham’s Disk
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In this activity (on page 2 of the PDF under GPS: Light and Color Activity), learners will see the illusion of colors produced by a rotating black and white image known as Benham’s Disk.

Periscope
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In this optics activity, learners build a spy tool to secretly view things over walls or around corners.

Seeing Your Retina
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In this quick optics activity, learners use a dim point of light (a disassembled Mini MagLite and dowel set-up) to cast a shadow of the blood supply in their retina onto the retina itself.

Look Into Infinity
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Learners use two mirrors to explore how images of images of images can repeat forever.

Vanishing Rods
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This is a quick activity/demonstration that introduces learners to the concept of index of refraction. Learners place stirring rods in a jar of water and notice they can see them clearly.

Night Eyes
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In this outdoor, night-time activity, learners discover how to spot eye-shine (reflection of light from an animal's eyes) by using a flashlight to play a simulation game.