Technology is essential to modern life, yet few of us are technology-literate enough to know much about the engineering that underpins it. In this book, David P. Billington, Jr., offers accessible accounts of the key twentieth-century engineering innovations that brought us into the twenty-first century. Billington examines a series of engineering advances--from Hoover Dam and jet engines to the transistor, the microchip, the computer, and the internet--and explains how they came about and how they work.