Your kid asks how everything works. Now you will have the answers.

Curious kids want to know how toilets, rockets and their own heartbeat work, and "it just does" never satisfies them. This book answers those questions, each with a clear explanation and a big labeled picture.

Try one right now:

• The toilet: "Every toilet in your house is holding a hidden pool of water, waiting for one press of a handle to set off a tiny flood."
• Popcorn: "A popcorn kernel is really a tiny sealed pressure tank, and it explodes the moment that pressure gets too strong to hold."
• The helicopter: "A helicopter can freeze in midair like nothing else that flies, hanging perfectly still above one spot on the ground."

And that is just the start. The Big Machine Tour has 10 stops, from the kitchen to outer space.

• Answer, then picture: a short answer followed by a big labeled step-by-step picture.
• Real numbers: fact-checked By The Numbers and History Bite boxes for every machine.
• Hands-on fun: safe experiments, Spot It checklists and an Engineer's Notebook at every stop.
• Made to keep: a dictionary, a timeline, a quiz and a Junior Engineer Certificate.

For the grown-ups: reading that sparks real conversations, and a book kids 7 to 11 pick up on their own.

Add it to your cart today and turn the next "how does that work?" into a shared moment.

A perfect birthday, Christmas or back-to-school gift for curious kids, and a keeper from grandparents to the grandchild who always asks how.