• What are lymph nodes? 
  • What do lymph nodes do?
  • What causes swollen lymph nodes?
Find it out

Lymph nodes are part of the ___________ system.

Test your knowledge
  • What is cloud cover?
  • How do clouds affect the temperature?
  • What is cloud-climate feedback?
Find it out

Why is it colder on clear nights than on cloudy nights?

Test your knowledge
  • What are 360 waves?
  • How do you make 360 waves? 
  • What is cultural appropriation?
Find it out

Which hairstyle’s popularity is credited to stars like Josephine Baker and Missy Elliot?

Test your knowledge
  • What are hex color codes?
  • What are RGB colors?
  • Why do people use hex color codes?
Find it out

Which color is NOT referred to by any pair of characters in a hex color code?

Test your knowledge
  • Do any mammals lay eggs?
  • What are some of the unique characteristics of the platypus?
  • What is a monotreme?
Find it out

Which of the following animals does the platypus resemble, according to this Wonder?

Test your knowledge

Where are You Wondering?

Discover Wonder Hotspots nearby and join!


What Are You Wondering?

Join in the Wonder Creation

Make YOUR wonder a wonderful reality!


...Questions in the Wonder Bank and counting! Here are the latest...

Latest from the Wonder Bank

  • How deep is the ocean?
  • How do you deafeat the coronavirus
  • How do you read ancient egyptian hieroglyphics?
  • Was there a possibility to stop the asteroids that made dinosaurs be extinct?
  • who cam up with phones
  • what are bengal tigers
  • How are books made?
  • what is agite
  • why were things named what there names are
  • How are their so many species of wolves?
  • What does John Cena Do in his spare time
  • Black samurai
  • How Many people play Minecraft?
  • why do people abandon animals?
  • What are some Facts about Snowmen?
  • Who created homework
  • why do goats faint
  • How is lightning created?
  • why is music a thing
  • why do we die
  • when will world war 3 happen
  • how does a vhs tape work?
  • are aliens real or fiction.
  • what happens when you drill to the middle of the moon
  • What would the whole world taste like?
  • Why do some people think narwhals are not real?
  • How hot is the suns core?
  • what is the hottest food in the world
  • is it ok to not fall asleep
  • How are the amount of people in the world counted?
View all questions in the Wonder Bank

Top Nominated Wonder Questions:

  • +58

    Why do Olympians bite their medals?

    Sam — Glen Allen, VA

  • +50

    What causes blindness?

    Katherine — Owatonna, MN

  • +46

    How does weeds grow?

    Rafiul — Sydney, AL

  • +38

    How many animals are on earth?

    helaina — clearwater, FL

  • +35

    Why does a slinky get tangled so easily and is so hard to untangle?

    Terry — Garner, NC

  • +34

    Why do we procrastinate?


Vote for wonder nominees

Explore the World of Wonders

Discover the latest Wonders from SCIENCE: Science, Health And Fitness, Illness, Infection, Stress, Lymph Nodes, and more

Wonderopolis #17

Can You Garden in the City?

Over seven billion people call Earth home these days. Feeding all those hungry people is no small task. Fortunately, scientific advances have helped to modernize agriculture to the point where billion...

Wonderopolis #1

Why Are Flamingos Pink?

We were hanging out on the Wonderopolis seashore the other day when we overheard an interesting conversation between a seagull and a pelican:

Wonderopolis #3

Can Plants Eat Insects?

When you think of a jungle adventure, what comes to mind? Swinging around from tree to tree on vines? Gorgeous birds flying through the air? Monkeys and other exotic creatures prowling through the den...

Wonderopolis #19

What Would You Pack For a Trip To Outer Space?

Have you ever dreamed of traveling in space? For many kids, gazing at the stars leads to daydreams about what it would be like to be an astronaut. Would you like to travel on a spaceship? Just think a...

Spread the Joy of Wonder

Wonderopolis Widget

Interested in sharing Wonderopolis® every day? Want to add a little wonder to your website? Help spread the wonder of families learning together.

Add widget

Wonderopolis Partners & Sponsors


Spread the Joy of Wonder

Wonderopolis Widget

Interested in sharing Wonderopolis® every day? Want to add a little wonder to your website? Help spread the wonder of families learning together.

Add widget