Simon Winchester discusses the Great California Earthquake of 1906, which he has written about extensively in his new book, A Crack in the Edge of the World: America and the Great California Earthquake of 1906. Simon Winchester, who has brought the unlikely subject of geology to the literary forefront in his national bestsellers Krakatoa and The Map That Changed the World, now shines his literary light on the most dramatic natural calamity in US history in A Crack in the Edge of the World: America and the Great California Earthquake of 1906. Using the devastating 7.9 quake that struck the bustling city of San Francisco as a narrative springboard, Winchester offers a panoramic blend of history and science that captures the "savage interruption" and its destructive aftermath with gripping immediacy. Winchester explores the global geology that jolted the Earth awake on the fateful day and suggests why it certainly will happen again.