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    Why Do We Need Soil?
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    3.5   | 
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    Why Do We Need Water?
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    2.8   | 
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    Why Is Ice Slippery?
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    Why Should I Eat This? (6 titles)
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    Why Should I Save for a Rainy Day?
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    Why We Need Carbohydrates
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    Why We Need Fats
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    Why We Need Minerals
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    Why We Need Proteins
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    Why We Need Vitamins
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    Why We Need Water and Fiber
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    Wild and Pet Puppies
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    2.9   | 
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    Wildfire Alert!
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    6.3   | 
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    Wildfire Readiness
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    Wildfires
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    Wildlife Worlds Africa
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    5.7   | 
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    Wildlife Worlds Asia
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    6.0   | 
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    Wildlife Worlds Australia and Antarctica
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    5.7   | 
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    Wildlife Worlds Europe
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    5.7   | 
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    Wildlife Worlds North America
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    5.7   | 
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    Wildlife Worlds South America
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    5.7   | 
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    William Kamkwamba: Powering his Village
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    William Lloyd Garrison: A Radical Voice Against Slavery
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    6.6   | 
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    William Shakespeare
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    5.2   | 
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