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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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  What Causes a Shooting Star?

  Today’s Wonder of the Day features some real rock stars that are out of this world!

  #11

  What Causes a Shooting Star?

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  How Old Are Fairy Tales?

  If all the fairy tales got mixed up, what stories would they tell? Let’s find out today in Wonderopolis!

  #21

  How Old Are Fairy Tales?

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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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  Why Do Bubbles Float?

  What gives bubbles their flying clout? Hint: It’s all about gas power!

  #57

  Why Do Bubbles Float?

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  Why Is April 11, 1954, the Most Boring Day in History?

  This Wonder of the Day is anything but BORING!

  #2772

  Why Is April 11, 1954, the Most Boring Day in History?

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  Why Do Some Years Leap Ahead?

  Today’s Wonder of the Day only comes around once every four years. Don’t miss it!

  #514

  Why Do Some Years Leap Ahead?

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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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  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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  Who Invented Rock and Roll?

  Are you ready to jam? You might want to turn today’s Wonder of the Day up to 11!

  #2000

  Who Invented Rock and Roll?

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  Who Is the Unknown Soldier?

  We’d love to tell you who today’s Wonder of the Day is about, but unfortunately we don’t know.

  #404

  Who Is the Unknown Soldier?

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  Why Do You Have To Go To Bed Before Dark?

  If you want to be prepared for the Wonder of the Day, you need to get a good night’s sleep. Time for bed!

  #316

  Why Do You Have To Go To Bed Before Dark?

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  Why Should We Remember the Alamo?

  We wish we had already told you about today’s Wonder of the Day, because we need help remembering!

  #508

  Why Should We Remember the Alamo?

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  When Is the Winter Solstice?

  Join us in Wonderopolis today as we greet a new season!

  #1587

  When Is the Winter Solstice?

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  What Is Ramadan?

  Join us today when we’ll learn about a religious holiday that’s celebrated by millions of people around the world!

  #308

  What Is Ramadan?

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  Where Is the Largest Library in the United States?

  Be sure you “check out” today’s Wonder of the Day!

  #568

  Where Is the Largest Library in the United States?

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  What Is an Aqueduct?

  Join us in Wonderopolis today as we go with the flow!

  #2124

  What Is an Aqueduct?

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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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  How Long Can You Hold Your Breath Underwater?

  Take a deep breath and get ready to plunge into today’s all-new Wonder of the Day!

  #310

  How Long Can You Hold Your Breath Underwater?

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