Charlie Brown and the Peanuts gang help answers questions about machines and how they work. A great way to share how a a zipper works, what makes springs bouncy, or why grandfather clocks are tall.
This book tells all about how various things work. The book is pretty old, but I think the vast majority of the info still holds up. Things like a bathroom scale (spring) and a doctor's scale (levers), a pencil sharpener (both manual and electric), escalators and elevators, and much more....