Introducing Time: A Graphic Guide

What is time? The 5th-century philosopher St Augustine famously said that
he knew what time was, so long as no one asked him. Is time a fourth
dimension similar to space or does it flow in some sense? And if it flows,
does it make sense to say how fast? Does the future exist? Is time travel
possible? Why does time seem to pass in only one direction? These questions
and others are among the deepest and most subtle that one can ask, but
Introducing Time presents them - many for the first time - in an easily
accessible, lucid and engaging manner, wittily illustrated by Ralph Edney.