A really great book by Steve Parker about how things work.
The book is aimed at children between the age of 8 and 12. I think.
It explains how various things work, which you use, or see, almost every day.
The things are neatly categorized by the place where they are found, or
the time when they are used (e.g. "Home", "When you get up").
All explanations come with clear illustrations.