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100 Things to Know about the Unknown: A Fact Book for Kids

by Jerome Martin, Alice James, Lan Cook, Tom Mumbray, Alex Frith

Part of the 100 THINGS TO KNOW ABOUT series

Subject
Curiosities & Wonders
Age
6-8 years
Format
Hardcover
Pages
128
Publisher
Usborne Publishing, Limited
Size
17.6 cm × 24.2 cm
ISBN
9781805317869

What is dark matter? How fast could a T. rex run? How did Mary Queen of Scots keep her dying wishes secret from her enemies?

Scientists and historians have discovered a lot about our past, our future and how the world works, but SO MUCH remains unknown. This exciting information book filled with 100 fascinating and mind-blowing facts explores the edges of human knowledge and the vast world of science just waiting to be uncovered.

With eleven books to explore in this best-selling and award-winning series, there are over 1,100 facts to discover. Packed with bold, graphic illustrations and clear text, the series is perfect for dipping in and out of, and for sharing with family and friends.

About the creators

Jerome MartinAuthor

Jerome Martin has written children's books about science, history, Shakespeare and food. Before joining Usborne in 2014, he spent a decade studying literature at Harvard, Cambridge and the University of Iowa, and several years behaving responsibly in a copywriting office. Now, he spends his working hours researching delightful and amazing facts, his evening hours parenting two children, and the minutes in-between writing poetry.

Alice JamesAuthor

Alice James joined Usborne after working in primary schools for a while. She absolutely loves science, and over the years has lived with chimps, spent a month in the rainforest, studied Biology at Oxford University, and grown 200 carnivorous plants (not necessarily in that order). Whilst at Usborne Alice has worked on books on all kinds of science topics, from space to energy to the periodic table.

Lan CookAuthor

Lan joined Usborne after working as a bookseller. She absolutely loves learning about anything and everything. She has lived in China, attempted to create the perfect aquarium biotope, studied Anglo-Saxon, Norse and Celtic at Cambridge University, and can hit an archery target from 100 feet away. Lan has always loved collecting knowledge and as many weird facts as possible, so working for Usborne really is a dream job!

Tom MumbrayAuthor

Tom studied History at university before joining Usborne in 2018. Since then he's worked on books about Planet Earth, technology, maths and inventions (and learned lots of amazing facts about everything from paleoburrows to fireworks along the way).

Data provided by BiblioShare.

$21.99In stock at our supplier — delivered within 5–9 days.

100 Things to Know about Science

Alex Frith, Jerome Martin, Minna Lacey, Jonathan Melmoth, Usborne

100 Things to Know about Space

Alex Frith, Alice James, Jerome Martin

100 Things to Know about Planet Earth

Jerome Martin, Alice James, Darran Stobbart, Tom Mumbray, Usborne

100 Things I Know How to Do

Amy Schwartz

100 Things to Be When You Grow Up

Lisa M. Gerry

100 Things to Be When You Grow Up

Lisa Gerry

Into the Unknown: How Great Explorers Found Their Way by Land, Sea, and Air

Stewart Ross

The Thing King

Kat Chew
© 2026 Peekabooks Inc. All Rights Reserved.
© 2026 Peekabooks Inc. All Rights Reserved.