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Convection Current
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In this activity, learners make their own heat waves in an aquarium.

Water Sphere Lens
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In this activity about light and refraction, learners make a lens and magnifying glass by filling a bowl with water.

See It to Believe It: Visual Discrimination
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In this activity (12th on the page), learners investigate their ability to discriminate (see) different colors.
The Bent Pencil
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In this optics activity, learners explore how light bends and affects what we see.

Make Money Appear Before Your Eyes
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In this optics activity, learners use water to make a coin "appear" and "disappear." Use this activity to demonstrate how light refracts and introduce light as waves.

Your Body in Your Mind's Eye
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This activity is about how you form mental images of your body's position in space, independent of vision. Can you take a sip of water from a cup with your eyes closed?
Mix and Match
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In this optics activity, learners explore color by examining color dots through colored water and the light of a flashlight.

Release the Rainbow
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In this activity, learners create a water prism to break light into the seven colors of the rainbow.

Bending Light
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In this optics activity, learners make a lens and explore how the eye manipulates the light that enters it.

Bubble Tray
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In this activity, learners use simple materials to create giant bubbles.
Guiding Light
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In this optics activity, learners use glass and water to demonstrate total internal reflection (TIR).
Why is the Sky Blue?
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In this activity, learners create a "mini sky" in a glass of water in a dark room.

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.

Make Your Own Sea Otter
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In this activity about sea otters, learners make their own "otter whiskers" and use them to find objects underwater.

Periscope
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In this activity, learners construct a device that allows them to look over ledges or around corners.

Total Internal Reflection
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In this activity, learners use a laser pointer, empty soda bottle, rubber plug and water to demonstrate total internal reflection.

Critical Angle
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In this optics activity, learners examine how a transparent material such as glass or water can actually reflect light better than any mirror.

Invisible Ink
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In this simple chemistry activity (page 1 of PDF under SciGirls Activity: Colorblind Dogs) about acids and bases, learners will mix a baking soda and water solution and use it to paint a message on a

Iridescent Art
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This is a quick activity (on page 2 of the PDF under Butterfly Wings Activity) that illustrates how nanoscale structures, so small they're practically invisible, can produce visible/colorful effects.

Blue Sky
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In this optics activity, learners explore why the sky is blue and the sunset is red, using a simple setup comprising a transparent plastic box, water, and powdered milk.