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How Pizza Works

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People have strong opinions about pizza -- in terms of passion, it ranks right up there with politics and religion. How did this Italian peasant food become a diet staple?

If you're like most people, you've never heard of the Maybach. It's an unbelievable driving machine complete with back-seat writing tables and an engine that can outperform the Corvette's. Check out the Maybach.

How Spies Work

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Spying is a tense and often deadly way for governments to gather secret information from their enemies. Learn how spies are recruited and how they obtain information.

10 Most Long-lived Empires in History

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Which historical empires lasted the longest? Read about the 10 most long-lived empires in history.

How Spanish Traditions Work

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What kinds of traditions are celebrated in Spain? Read about Spanish traditions at HowStuffWorks.

Gum Disease Explained

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Gum disease, gingivitis, tooth decay -- they're all related. Learn how you can avoid gum disease and treat gum disease.

How Denim Insulation Works

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Do you love your jeans so much that you want them to stay in your house forever and ever? Then you're going to love denim insulation, the blue way to go green.