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Lawrence Krauss explores the unanswered questions at the forefront of science today and likely for the coming century and beyond.

Internationally known theoretical physicist and bestselling author Lawrence Krauss explores science's greatest unanswered questions.

Three of the most important words in science are "I don't know." Not knowing implies a Universe of opportunities—the possibility of discovery and surprise. Our understanding of science has advanced immeasurably over the last five hundred years, yet many fundamental mysteries still persist. How did our Universe begin? How big is the Universe? Is time travel possible? What's at the centre of a black hole? How did life on Earth arise? Are we alone? What is consciousness, and can we create it?

These mysteries define the edge of science - the threshold of the unknown. Exploring these known unknowns is to gain a deeper understanding of just how far science has progressed. Covering time, space, matter, life, and consciousness, Krauss introduces readers to topics that will shape the state of science for the next century, providing us all a passport for our own journeys of discovery and exploration.