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What Are the Northern Lights?

Today’s wonder will have you seeing the night sky in a whole new light. Let’s explore the Aurora Borealis!

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What Are the Northern Lights?
When Were ZIP Codes Invented?

ZIP into Wonderopolis for today’s Wonder of the Day!

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When Were ZIP Codes Invented?
What Is a Prime Number?

Today’s mathematical Wonder of the Day may have you counting 2, 3, 5, 7, 11, 13, 17, 19, 23, 29…

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What Is a Prime Number?
What Is Cryptozoology?

Check out today’s MONSTER of a Wonder of the Day!

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What Is Cryptozoology?
Who Was Clara Barton?

Do you believe in angels? Join us in Wonderopolis today to meet the woman Civil War soldiers called “the angel of the battlefield.”

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Who Was Clara Barton?
Why Are Some Cheeses Stinky?

Whew! What’s that smell? Hold your nose when you join us for today’s Wonder of the Day!

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Why Are Some Cheeses Stinky?
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?