Engineering is where human knowledge meets real-world problems—and solves them. It's the source of some of our greatest inventions, from the catapult to the jet engine. Marshall Brain, creator of the How Stuff Works series and a professor at the Engineering Entrepreneurs Program at NCSU, provides a detailed look at 250 milestones in the discipline. He covers the various areas, including chemical, aerospace, and computer engineering, from ancient history to the present. The topics include architectural wonders like the Acropolis, the Great Wall of China, and the Eiffel Tower; transportation advances such as the high-speed bullet train; medical innovations, including the artificial heart and kidney dialysis; developments in communications, such as the cell phone; as well as air conditioning, DNA fingerprinting, the Large Hadron Collider, drones, and more.