Learning is an adventure

A world of curious minds.

Ciorium makes big ideas fascinating, visual and easy to understand. Explore science, history, places and nature with Cio and Bella, through books, online activities and, soon, videos.

Start exploring For parents & teachers

Ages 6 to 14Every fact checkedBooks + onlineNo ads

"There's always something amazing to discover!" — Cio

Explore by topic

What do you want to discover today?

Ciorium is growing into a full learning hub. Places & Cultures is open now, with more subjects on the way.

Places & Cultures

States, cities and countries: the people, landmarks and stories that make each place special.

Now: Road Trip Across America

Science

Why the sky is blue, how volcanoes work, and the experiments that changed the world.

Coming soon

History

Gold rushes, inventors, explorers and the moments that shaped how we live today.

Coming soon

Nature & Animals

Giant trees, clever animals and the wild places that need us to care for them.

Coming soon

Space

Planets, stars, rockets and the big questions about what is out there.

Coming soon

How Things Work

Bridges, GPS, rockets and robots: take the world apart and see what is inside.

Coming soon

Ways to learn

Read it, play it, watch it

Books

Coloring and activity books packed with Amazing Facts, puzzles and things to spot.

See the books →

Online activities

Scan the QR code in any book to color the page online, solve puzzles and collect passport stamps.

Open my passport →

Videos Coming soon

Short videos where Cio chases the answer to a big question.

WHY?WHAT IF?WOW!HOW?DISCOVERLEARN IT

Featured series

Now open: Road Trip Across America

Road Trip Across America: California cover

Ciorium Explorers · Ages 6 to 10

One book for every state

Join Cio and Bella on an amazing adventure! Each book has 25 adventures with coloring pages, 200 Amazing Facts, puzzles and a road trip map. Every coloring page comes alive online.

California: out now6 more states comingColor & play online

Explore the series →

Your guides

Meet Cio and Bella

Cio waving in a redwood forest — The Curious Explorer
Cio
Goggles on, backpack packed. Cio wants to climb, peek and poke at everything, and he isn't afraid to get it wrong.
"There's always something amazing to discover!"

Bella holding a map on a California beach — The Investigator
Bella
Map in hand and a question ready. Bella checks the clues, reads the signs and figures out how things fit together.
"There's always something new to learn!"

For parents & teachers

Curiosity today. A brighter tomorrow.

Ciorium is built to be fun first and accurate always. Here is what you can count on.

Every fact checkedEach fact is checked against a trusted source, like the National Park Service, and the source is shown online.

Safe for kidsNo ads, no chat and no child accounts. Progress is saved on your own device.

Complete on paperEvery book works on its own. The online activities are a free bonus.

Any deviceWorks on phones, tablets and computers. No app to install.