Now a hot research topic, the physics of time travel attracts many a relativist convinced that there is nothing in the laws of physics to forbid travelling backwards in time. Barry Chapman is one of this band, and in Reverse Time Travel (Cassell, 拢16.99, ISBN 0 304 524 5) he reveals his favourite solution to the familiar time-travel paradoxes, the notion of parallel worlds. Time travellers would slip sideways in time. A surprisingly dull treatment of an exciting subject, but lots of background on Einstein鈥檚 theories.
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