| Hot Dogs: The Long Story |
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| Hot Hair |
New!
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| How Agriculture Changed the World |
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| How Can I Be an Ally? |
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| How Digital Communications Changed the World |
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| How Energy Changed the World |
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| How Fast Fashion Changed the World |
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| How Pets Changed the World |
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| How Plastic Changed the World |
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| How Roberta Vinci Stunned Serena |
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| How the Heck Does That Work?! (8 titles) |
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| How the World Celebrates (6 titles) |
New
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| How the World Worships (7 titles) |
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| How to Handle Cyberbullies |
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5.2 |
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| Human Service |
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6.0 |
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| Hunted by Predators Hacks |
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| Hurricane Katrina and America's Response |
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| Hurricanes |
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| Hydra |
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| Hydroelectric Energy |
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6.4 |
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