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Sound Off!
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This activity includes several games about animal sounds. Using their sense of hearing and communicating with various kinds of noisemakers, learners role-play predator and prey.

Kimchee Fermentation Chamber
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Learners make kimchee or sauerkraut, which is really just fermented cabbage, in a 2-liter plastic bottle.

Take a Hike!: A Family Forest Walk
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In this family or group inquiry activity, learners use their senses to explore a local forest or woodland.

Spinning Illusions
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In this activity, learners construct three optical illusion toys to examine how our brains play tricks on what we see.

Headphone Helper
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In this design challenge activity, learners add headphones to a previously built instrument (see "Build a Band" activity) to make it easier to hear.

Our Beautiful World
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In this Bob the Builder(TM)-themed activity, learners go on a nature walk outside and describe what they observe using their senses.

Stereoscope
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In this activity, learners construct a device that allows them to view 2-D images in 3-D.

It's Natural
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This activity introduces learners to Native Americans as people who depended upon nature in the past and continue to emphasize the importance of nature in the present.

Design a Flavor: Experiment to Make Your Own Ice Cream Flavor!
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In this delicious activity, learners get to make, taste-test and compare their own "brands" of homemade strawberry ice cream.

Music and Sound
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This activity (on page 2 of the PDF under SciGirls Activity: Music and Sound) is a full inquiry investigation into sound frequency.

Benham's Disk
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In this activity, learners make a Benham Top to explore visual illusions and optics.

Underwater Hide and Seek
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In this activity, learners experience firsthand how marine animals' adaptive coloration camouflages them from prey.

Odors Aloft
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Learners smell balloons filled with different scents to guess what's inside. From this, they infer the presence and motion of scented molecules.

Cloud Fun
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Learners complete a series of hands-on and investigative activities to explore cumulus clouds.