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Wonderopolis

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.

#399

What Is a Spit Valve?
Where Is Siberia?

Wonderopolis takes a trip to one of the biggest, coldest places in the world today!

#2082

Where Is Siberia?
Who Invented the Jukebox?

If you’re joining us in Wonderopolis today, you’d better bring your dancing shoes!

#2024

Who Invented the Jukebox?
Do Opposites Attract?

Today’s Wonder of the Day might be the opposite of what you expect!

#723

Do Opposites Attract?
Why Are Dimes Smaller Than Pennies?

We wouldn’t CHANGE a thing about today’s Wonder of the Day!

#1614

Why Are Dimes Smaller Than Pennies?
How Do We Know the Temperature of Earth’s Core?

Today’s Wonder of the Day will really get to the core of things!

#1355

How Do We Know the Temperature of Earth’s Core?
What Is Earth’s Core Made of?

Today’s Wonder of the Day is hard core!

#1306

What Is Earth’s Core Made of?
How Smart Are Vending Machines?

If you like candy or soda, today’s Wonder of the Day will be a nice change of pace!

#488

How Smart Are Vending Machines?