Book excerpt: "In a global tour de force, Weighing the World recounts the 100-year quest to discover the enigmatic natural energy - the curious capability that mountains have to bend gravity - and of an extraordinary experiment that transformed our understanding of the world. Written to appeal to general readers interested in popular science and geographical intrigues, this book will also be greeted enthusiastically by surveyors, historians of science, physicists, teachers, and other specialist audiences."--BOOK JACKET.