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  Why Does Hair Turn Gray?

  There’s nothing black and white about today’s Wonder of the Day!

  #6

  Why Does Hair Turn Gray?

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  Why Do Birds Fly in a V?

  What’s that up in the sky? Is it a plane? No, it’s today’s Wonder of the Day!

  #28

  Why Do Birds Fly in a V?

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  Why Do Superheroes Have Secret Identities?

  If you’re coming to Wonderopolis today, don’t forget to bring your cape!

  #15

  Why Do Superheroes Have Secret Identities?

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  Why Do Some Eggs Have Two Yolks?

  Join us in Wonderopolis today to help us eggs-plore a mystery!

  #8

  Why Do Some Eggs Have Two Yolks?

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  Can You Travel the World Without Leaving Home?

  Today's Wonder of the Day will have you traveling all over the world...without ever leaving home!

  #10

  Can You Travel the World Without Leaving Home?

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  Where in the World Is Kolkata?

  Join us in Wonderopolis today for a visit to one of the most populous countries in the world!

  #2022

  Where in the World Is Kolkata?

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  How Many Hot Dogs Can You Eat In 10 Minutes?

  We sure hope you’re hungry. Today’s Wonder of the Day is sure to fill you up!

  #273

  How Many Hot Dogs Can You Eat In 10 Minutes?

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  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…

  #190

  What Is a Prime Number?

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  How Does the Binary System Work?

  We need help deciphering today's Wonder of the Day—it's all ones and zeroes!

  #1869

  How Does the Binary System Work?

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  Who Is the Tallest Person in the World?

  Join us in Wonderopolis today for a look (up!) at some of the world’s towering figures!

  #1217

  Who Is the Tallest Person in the World?

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  What Is a Wigwam?

  Today’s Wonder of the Day feels just like home!

  #1305

  What Is a Wigwam?

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  How Can Negative Numbers Exist?

  We hope today’s Wonder of the Day leaves you feeling positive!

  #2327

  How Can Negative Numbers Exist?

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  How Were Birthstones Chosen for Each Month?

  Enjoy your visit to Wonderopolis today as we examine some precious stones!

  #1211

  How Were Birthstones Chosen for Each Month?

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  How Far Can a Paper Airplane Fly?

  Spread your wings and take flight with today’s all-new Wonder of the Day!

  #626

  How Far Can a Paper Airplane Fly?

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  What Was the Lewis and Clark Expedition?

  Pack your bag for a long journey. Today Wonderopolis goes exploring with two pioneers who blazed a new path west!

  #223

  What Was the Lewis and Clark Expedition?

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  When Did the New Year’s Eve Ball First Drop in Times Square?

  If you come to Wonderopolis today, you’re sure to have a ball!

  #1594

  When Did the New Year’s Eve Ball First Drop in Times Square?

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  Who Was the First Person in Space?

  Today’s Wonder of the Day is out of this world!

  #890

  Who Was the First Person in Space?

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  How Long Is a Dog Year?

  Today’s Wonder of the Day takes a closer look at a unit of time that’s really for the dogs!

  #646

  How Long Is a Dog Year?

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  How Many Is a Googol?

  If you’re searching for clues about today’s Wonder of the Day, just cool your engines and read on!

  #411

  How Many Is a Googol?

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  Do Sea Cows Moo?

  You won’t want to miss today’s moo-ving Wonder of the Day!

  #314

  Do Sea Cows Moo?

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