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<p><div><span style="word-spacing:normal;">In the Time Travel chapter of The Fabric of Reality, a time machine is imagined to be an exotic sort of place. Imagine a room with a large opaque cylinder at its centre. The cylinder encloses an opaque revolving door and the only way in or out is via a single entrance cut in the side of the cylinder. When you enter the cylinder and go around one or more times and then exit you find yourself in the past. </span><br></div><div><br></div><div>Once you exit, however, the multiverse differentiates and the past you end up in is the past of a different universe to the one you left.</div><div><br></div><div>This poses a problem, however. How does one exit the time machine and stay alive? </div><div><br></div><div>The problem arises because
macroscopic objects like people are extended in space and so can't exit the time machine instantaneously. Different planes through your body end up in different past universes.</div><div><br></div><div>What is the solution to this? Is there a clever way to get out of a time machine alive?</div><div><br></div><div>~Sol</div><div><br></div></p>
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