Children ask a million questions: What? Why? How? - It is not always easy for parents to give interesting, correct and understandable answers for children. Scolar Kiadó's series for preschoolers helps with this, the latest, 11th volume invites you on an exciting adventure into the world of machines. The book "Trucks, grapples and tractors" is made exciting by a series of colorful, fold-out pictures. From the book, children can learn what a truck driver does, how grapples and bulldozers work on construction sites, and tractors and harvesters work in the fields. They can discover what parts a crane has or why it doesn't topple over. They can also learn about the parts and operation of fire engines and other special emergency vehicles.