| When the Ground Shook: San Francisco Earthquake of 1906 |
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| Who Are You? (8 titles) |
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| Whooping Crane |
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4.8 |
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| Wild Animals |
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3.0 |
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| Wild Boar |
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5.9 |
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| Wild Engineering |
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3.1 |
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| Wildfires |
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| Wildlife Photographer |
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5.6 |
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| Wild Wicked Wonderful (16 titles) |
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| Wind Power |
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5.4 |
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| Wind Turbine Service Technician |
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6.8 |
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| Witches |
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| Witches vs. Genies |
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| Witching Hour Hacks |
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| Women and Children First: Sinking of the Titanic |
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| Women's Rights |
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5.9 |
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| Women's Rights |
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4.1 |
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| Wonderful Wikis |
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5.4 |
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| World War II U.S. Homefront |
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| Write It Down |
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