I found this short book a delightful read. Davies gives us a brief overview of how current physics theory, in particular relativity and quantum mechanics, can allow the possibility for time travel, both to the future and, more surprisingly, to the past. He also briefly describes the kinds of paradoxes that can result from time travel to the past and how these paradoxes might be resolved. This brief introduction motivates me to seek more detailed treatments in the popularized science genre and the more technical physics research literature. ( )

If you're serious about sci-fi then you should probably read this book, it explains some of the science behind time and space in a concise and readable way. (It'll be of especial interest to fans of The Doctor. Allons-y!) ( )

Non sono un ottimo lettore di divulgazione scientifica, sopratutto quando questa è visionaria, improbabile e lontata dalla mia vita come questa relativa ai viaggi nel tempo. A mia parziale discolpa, il libro è arrivato in regalo da IBS, non l'avrei altrimenti mai acquistato.
D. ci prova ad essere simpatico, e a volte lo è. Tende a facilitare l'argomento, e a volte ci riesce.
Rimane il fatto che stiamo parlando di ipotesi che costituiscono un divertissement per i fisici, e questi si divertono con cose difficilissime, astruse, improbabili e di relativa utilita'. Un po' come tutti noi, ma io ho una formazione umanistica :-) ( )

An amusing, short, well written intro to the aspects of Relativity relating to time travel. ?Yes time travel. Written for some one with no more than a high school science education, it contains no scary equation. If you have a degree in physics, you will find it a tad boring. ( )

Why did I buy this book? It is a waste of my time and my money.

This jerk Paul Davies is not a scientist. He studied in science and had a higher education, but his view is corrupted by religious bullshit that you could smell his religious bullshit while reading this crap book.

He had turned to the dark side by accepting money from the anti-science Templeton Funcation. And he put bullshit mixed with what he science education.

It is just poision, not knowledge, that comes from reading his work.

Here is a quote from wiki on this jerk.

"The Edge Foundation presented a criticism of Davies's article written by Jerry Coyne, Nathan Myhrvold, Lawrence Krauss, Scott Atran, Sean Carroll, Jeremy Bernstein, PZ Myers, Lee Smolin, John Horgan, Alan Sokal and a response by Davies beginning I was dismayed at how many of my detractors completely misunderstood what I had written. Indeed, their responses bore the hallmarks of a superficial knee-jerk reaction to the sight of the words "science" and "faith" juxtaposed.[2] Richard Dawkins[3] and Victor J. Stenger[4] have also criticised Davies' public stance on science and religion."

I want my money back! ( )