Several decades ago, Leonard Susskind introduced the revolutionary concept of string theory to the world of physical science. In doing so. he inspired a generation of physicists who believed that the theory would uniquely predict the properties of our universe. Now Susskind argues that the very idea of such an "elegant theory" no longer suits our understanding of the universe, and that our narrow twentieth-century view of a unique universe will have to give way to the much broader concept of a gigantic cosmic landscape - a megaverse, pregnant with new possibilities. The Cosmic Landscape is a brilliant, paradigm-shifting work that examines a favorite claim of intelligent design theory that the universe is fine-tuned so that we can be here to observe it - and uses that controversial principle to show how physics can explain the universe.