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Why Do Catfish Have Whiskers?

Let’s dive in to find out what cats and catfish have in common.

#38

Why Do Catfish Have Whiskers?
Where Is the 38th Parallel?

Join us in Wonderopolis today as we travel to a peninsula split by an imaginary line!

#2088

Where Is the 38th Parallel?
What Is Mercury?

Today’s Wonder of the Day is a bit mercurial!

#921

What Is Mercury?
Can a Strait Be Crooked?

Sail on over to Wonderopolis today, and we’ll give you the strait story!

#421

Can a Strait Be Crooked?
What Is the Space-Time Continuum?

We hope you have the time to join us in Wonderopolis today. We’ll save you some space!

#1859

What Is the Space-Time Continuum?
Who Was the First Female and American Indian Engineer?

Join Wonderologists today as we learn about a woman who played an important role in putting people on the moon.

#2928

Who Was the First Female and American Indian Engineer?
What is a Ghost Ship?

This Wonder of the Day is anything but BOO-ring!

#2459

What is a Ghost Ship?
What Is AIDS?

Learn about a global epidemic in today’s Wonder of the Day.

#2829

What Is AIDS?
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?
Who Is Uncle Sam?

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

#527

Who Is Uncle Sam?
How Do Mood Rings Work?

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

#412

How Do Mood Rings Work?