Looks behind fortress walls to explore how they were built to house hundreds of people and animals, the important rooms, the people who lived in them, and what castle life was like.

Traces the history and development of aircraft from hot-air balloons to jetliners, and includes information on the principles of flight and the inner workings of various flying machines.

Surveys various sources of energy and the ways in which they have been harnessed.

"Unearth a treasure trove of geological knowledge with this in-depth guide to over 500 rocks and minerals."

"Did you know that sharks first appeared in the oceans 200 million years before the dinosaurs, and that they have an electrical sixth sense that helps them locate their prey? How dangerous is a great white shark? Can a whale shark really grow as big as a city bus? If you find yourself seeking the answers to these questions, then this may be the book for you! Discover where they live, why they are hunted, and what can be done to protect them. The book...