Thrice upon a time by James P Hogan is a short novel centered around a time machine. Fortunately this time machine differs from your typical H.G. Wells affair and can only transmit and receive information. While this can still lead to several paradox’s it does make it harder to kill ones grandfather. The actual theories explored by the characters as they uncover the capabilities of this machine make for an interesting read.

One of my favourite theories concerns parallel universes:

Suppose you send last nights lottery results to yourself in the previous day. Back in the previous day an alternative reality is created where you get the results and win the lottery. Well that’s great… except that doesn’t really help the you who just sent the winning numbers.

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I can’t exactly recall who (or what) recommended this book to me but thanks!