How does a train stay on the tracks? What's going on inside a pogo stick? How do cranes work? And what happens when you flush a toilet?

These and many more important questions are answered in this fascinating book. From toasters and telephones to hovercrafts and robots - the inner workings of machines big and small are brought to light using a stunning mix of cross-sections, close-ups and cutaways.

Illustrated by: Valpuri Kerttula