| Understanding Extreme Temperatures |
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| Understanding Floods |
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| Understanding Hurricanes |
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| Understanding Identity |
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| Understanding Others |
New
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| Understanding Pandemics |
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| Understanding Tornadoes |
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| Understanding Volcanic Eruptions |
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| Understanding Wildfires |
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| UNICEF |
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4.5 |
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| Unicorn Yoga |
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| United Way |
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5.1 |
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| Unnatural Disasters: Human Error, Design Flaws, and Bad Decisions (6 titles) |
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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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| Up to the Hills |
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| Uranus |
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1.7 |
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| Uranus |
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3.3 |
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| Use a Tissue! |
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1.9 |
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