| The Rise of Environmentalism |
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| The Rising Tide of Lava: Chaos on Mars |
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| The Roaring 20s and Prohibition |
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| The Sand Seas of Mars: Repairing the Rover |
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| The Scoop on Ice Cream |
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| The Search for El Dorado |
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| The Seasons (4 titles) |
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| The Secret Society of Monster Hunters (16 titles) |
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| The Senses |
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| The Simpsons Predict the Future |
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4.4 |
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| The Skeletal and Muscular Systems |
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| The Sky Is Falling: Impact Earth |
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| The Slice on Pizza |
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| The STEM Files (8 titles) |
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| The Stinky Sphinx |
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| The Stock Market in Infographics |
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| The Stolen Kraken |
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| The Sun Is Hot |
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| The Titanic |
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| The Trouble with Deepfakes |
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4.8 |
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