The Light Bulb
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Venus
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Dragsters
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Physicist
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2.9 |
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Australia
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Staying Safe Online
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Finding Information
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The Printing Press
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Guatemala
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2.7 |
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Computer Programmer
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2.8 |
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Switzerland
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England
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2.9 |
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The Moon
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Saving the Gray Whale
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2.9 |
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Saving the Sea Otter
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2.9 |
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Saving the American Bison
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2.8 |
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Clothing Then and Now
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2.8 |
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The Camera
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Karts
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Saving the Gray Wolf
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2.7 |
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Ecologist
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2.9 |
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Ecuador
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2.9 |
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Sports Cars
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Earth
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