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Space and time are the most fundamental features of our experience, and yet they are also the most puzzling. Did time have a beginning? Is there space beyond the universe? Would time go on if everything else stopped? Could space exist with nothing in it? Might time travel be possible? Are there parallel worlds? Could time go backwards? Is there a fourth dimension of space? Are space and time just the constructions of our minds? Robin Le Poidevin provides a clear, witty, and stimulating guide through these and many other puzzles and paradoxes. Drawing on a variety of examples from science, history, and literature, he gives a vivid sense of the difficulties raised by our ordinary ideas of space and time, and equips us to think about these problems for ourselves. No prior knowledge of science or philosophy is required to enjoy this book. The universe might seem very different after reading it.