Abstract
An overview of time travel - the mystery of time travel machineless time travel without dreams or drugs time travel by machine H.G. Wells - why his time machine won't work travelling to the future on the nature of time, spacetime and the fourth dimension - what is time? speculations on the reality of time has the past been for ever? time and clocks hyperspace and wormholes the arrows of time - language of time travel does time have a direction? cause and effect what does now mean? irreversibility time-travel paradoxes and (some of) their explanations - paradoxes early science fiction speculations on time-travel paradoxes can the present change the past? can the past be un-done? changing vs. affecting the past. Epilogue.
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