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How did people travel when locomotive engines were not invented? When was the first steam engine invented? What led to the invention of self-driving vehicles and how do they work? This Encyclopedia will answer these and more hows and whats for you. Learning is made simpler with well-labelled diagrams and an extensive glossary of difficult words. Bonus: The book comes loaded with Isn't It Amazing-a section of fun facts to keep you glued for more.