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Glue Stick Sunset
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In this activity, learners explore why the sky is blue. Learners model the scattering of light by the atmosphere, which creates the blue sky and red sunset, using a flashlight and clear glue sticks.

Effect of Environment on Plant Growth
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The purpose of this plant biotechnology activity is to demonstrate the effect of changes in the environment on the growth and fertility of landscape grasses and crop grasses such as wheat and rice.

Born of Blood: Craft Stick Chromosomes
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In this activity, learners work in groups to match craft sticks that represent chromosomes. Learners must define critical attributes of their chromosomes as they look for matching chromosomes.

Jelly Beads
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Learners add drops of alginate solution to a solution of calcium chloride. The alginate does not mix with the calcium chloride, but forms soft gel beads.

Fruity-Glows: Pictures of Health on a Microarray Canvas
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In this activity (page 12), learners apply the concepts of pixilation and pointillism to the world of biomedical science.

Dinosaur Bone Experiments
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This activity features two connected hands-on activities about dinosaur bones.

Demonstrating An Epidemic
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This experiment allows learners to experience a small scale "epidemic," demonstrating the ease with which disease organisms are spread, and enables learners to determine the originator of the "epidemi

Shake and Match
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In this activity, learners create a hearing based memory game that they can share with friends.

Benham's Disk
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In this optics activity, learners discover that when they rotate a special black and white pattern called a Benham's Disk, it produces the illusion of colored rings.

Soccer Kicks
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This activity (on page 2 of the PDF under SciGirls Activity: Soccer Ball Kick) is a full inquiry investigation into transfer of motion.

Soap Film on a Can
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The beautiful iridescent colors of a bubble in a can! With this Exploratorium Science Snack, create beautiful soap films on the open end of a can to see beautiful rainbows of color.

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.

Stereoscope
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In this activity, learners construct a device that allows them to view 2-D images in 3-D.
Hexagon Hunt
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This activity gets learners looking at 6-sided shapes in nature, including the cells of a beehive, as well as other shapes.

Audio Boggle: Make a Sound Track
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Audio Boggle is an activity that lets you listen to a track (that you make yourself) and see what you can hear!

Kaleidoscope
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In this activity, learners build inexpensive kaleidoscopes using transparency paper and foil (instead of mirrors).

Do Cities Affect the Weather?
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In this activity, learners explore clouds and how they form.

First Impressions
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Learners experiment with a commercial photo-sensitive paper (Sunprint® or NaturePrint® paper). They place opaque and clear objects on the paper and expose it to bright light, observing the results.

Ripening of Fruits and Vegetables
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In this activity, learners test the rate of ripening fruit and vegetables and use a chemical to inhibit the ripening process.

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.