What is time? What is consciousness? Why does the universe exist? Decades of foundational work in science and technology have led Stephen Wolfram to tackle some of humanity's oldest philosophical questions - and to argue that it is now possible to arrive at answers long thought beyond the reach of meaningful progress. These lively and engaging essays cover topics from timeless philosophical questions to artificial intelligence and the future of the human condition. Along the way, Wolfram makes a host of complex ideas understandable while challenging readers to rethink long-held assumptions. The book takes a fresh look at foundational concepts such as time, motion, free will, the nature of minds, mathematical truth - and what ultimately is there - all from new perspectives opened by recent advances in basic science.