| Understanding Pandemics |
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| Understanding Screen Addiction |
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| Understanding Suicide |
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| Understanding Tobacco |
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| Understanding Tornadoes |
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| Understanding Volcanic Eruptions |
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| Understanding Wildfires |
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| Under the Witch's Spell |
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| United Way |
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5.1 |
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| Units of Measurement |
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| Unnatural Disasters: Human Error, Design Flaws, and Bad Decisions (6 titles) |
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| Unofficial Guides (71 titles) |
New
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| Unofficial Guides (79 titles) |
Soon!
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| Unofficial Guides Junior (40 titles) |
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| Unwrapped: Marvelous Mummies (6 titles) |
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| Up and Down |
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1.1 |
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| Upfront Health (8 titles) |
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| Up to the Hills |
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| Uranus |
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1.7 |
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| Urban Legends: Don't Read Alone! (16 titles) |
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