100,000 Why's™
Where every question leads to wonder
100,000 Whys
100,000 Whys
Premium hardcover quality
Builds scientific thinking
Vivid illustrated pages
Perfect Gift
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100,000 Whys
"The illustrations are stunning and the explanations are so clear. My son loves it."
30-Day Warranty
30-Day Warranty
At Deravie, we want you to be 100% satisfied with your purchase. That’s why we offer a 30-day warranty from the date you receive the product.
If you’re not completely satisfied, simply contact our customer support team and we will handle the rest for you.
Shipping Information
Shipping Information
If you place your order now, we will ship it within 1-2 days.
And you can expect to get your package in 4-8 days depending on your location.
Just contact us at if you have any questions.
📚 What's inside
⚙️ How it works
❓ Ask a question
Each spread opens with a real why question kids genuinely ask about the world around them.
💡 Get a clear answer
Simple, jargon-free explanations break down science in a way any child can follow and remember.
🆕 Discover more
You know what? fact boxes add an extra layer of wonder to spark even more curiosity.
🧬 Think like a scientist
This format builds logical reasoning and a scientist's way of thinking over time.
What Our Customers Have To Say
91%
customers would recommend it to a friend or family member
95%
child was engaged with the book within minutes of receiving it
88%
increase in their child's curiosity and love of learning
*survey from 2,582 Deravie Users
⭐ What parents are saying
Verified reviews from families around the world
Sarah L.
🇺🇸 New York, USA · Verified
"My daughter can't put it down"
We bought this for our 7-year-old who never stops asking why. She reads it every night and comes to breakfast with five new facts to share. The illustrations are gorgeous and explanations perfectly pitched. One of the best purchases we've made this year.
James T.
🇬🇧 London, UK
"Brilliant quality. My son is obsessed. Already ordered a second copy for his cousin."
"Best children's book we own."
— Rachel K., 🇨🇦 Toronto, Canada
Amelia M.
🇦🇺 Sydney, Australia
"As a primary school teacher I recommend this to every parent. The way it breaks down science is exactly how children's brains work."
Daniel P.
🇮🇪 Dublin, Ireland
"My kids fight over who gets to read it first every night. Best problem I've ever had as a parent."
"Turned screen time into reading time."
— Mark W., 🇬🇧 Manchester, UK
"My daughter can't put it down"
Reads it every night and shares five new facts at breakfast. One of the best purchases we've made.
Sarah L. · 🇺🇸 New York
"Brilliant quality"
My son is completely obsessed. Already ordered a second copy for his cousin.
James T. · 🇬🇧 London
Need to know
Frequently Asked Questions
100,000 Whys is designed for children aged 6–12. The colourful illustrations and accessible language make it perfect for early readers, while the depth of content keeps older kids engaged and learning.
The book spans space & astronomy, dinosaurs & prehistoric life, nature & biology, chemistry, physics, and planet Earth — every page packed with answers to the questions kids actually ask.
Definitely not a textbook. 100,000 Whys is built around vibrant, full-colour illustrations and a joyful tone — designed to feel like an adventure that also builds your child's scientific thinking.
Most science books give kids answers. This one teaches them how to think like a scientist — developing curiosity, critical thinking, and a love of learning that lasts far beyond the classroom.
It's one of the finest gifts you can give a curious child. Hardcover, beautifully presented, and genuinely educational — parents consistently say it's the book their kids keep coming back to.
Standard shipping arrives within 3–7 business days. Expedited options are available at checkout. Every order is carefully packaged to ensure your book arrives in perfect condition.
We offer a 30-day hassle-free returns policy. If you're not completely satisfied for any reason, contact our support team and we'll make it right — no questions asked.