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Wonderopolis

How Tall Is the Eiffel Tower?

We’re not talking about fries, toast, bulldogs or manicures, but today’s Wonder of the Day does feature something distinctly French!

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How Tall Is the Eiffel Tower?
What Is a Spit Valve?

We don’t mean to toot our own horn, but we think today’s Wonder of the Day will be music to your ears.

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What Is a Spit Valve?
Who Is Uncle Sam?

Today’s Wonder of the Day features everyone’s favorite uncle!

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Who Is Uncle Sam?
How Do Mood Rings Work?

We hope you’re in the mood for an interesting Wonder of the Day today!

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How Do Mood Rings Work?