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  Using Solar Farms to Fight Climate Change

  $9.95 – $24.95Price range: $9.95 through $24.95
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  Using Wind Turbines to Fight Climate Change

  $9.95 – $24.95Price range: $9.95 through $24.95
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  Valleys

  $9.95 – $24.95Price range: $9.95 through $24.95
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  Vending Machines

  $9.95 – $24.95Price range: $9.95 through $24.95
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  Video Game Coding

  $9.95 – $24.95Price range: $9.95 through $24.95
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  Vitamins

  $9.95 – $24.95Price range: $9.95 through $24.95
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  Volcanologists

  $11.95 – $26.95Price range: $11.95 through $26.95
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  Voyage to Pluto

  $11.95 – $24.95Price range: $11.95 through $24.95
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  Walking, Biking, and Riding the Bus

  $8.95 – $22.95Price range: $8.95 through $22.95
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  Water

  $9.95 – $24.95Price range: $9.95 through $24.95
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  Water Contamination

  $9.95 – $24.95Price range: $9.95 through $24.95
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  Weather

  $9.95 – $26.95Price range: $9.95 through $26.95