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In this book you can learn about machine mechanism in our daily activities.'
This book covers all the basic questions a young child may have about the who, what, why, and especially the how of everyday things. Focusing on how things are made, refined, and used by people, this book provides kids with simple, accurate explanations.
This book, takes a closer look at all kinds of modern gadgets and inventions that make life easier. You'll learn about machines you use at home and vehicles for getting around.'
What do the rollere coaster's machines work?