r never sires her father and so her father never sires her and so she is not around to kill her grandfather. So the biography we described is paradoxical. It is not a biography that can possibly be lived. What makes it impossible is the role of time travel in it. It is tempting In this paragraph the Time Trav - eler motivates his project. He describes himself as resolv - ing a tension between our expectation that physicists should say whether time travel is possible and the existence of philosophical arguments that it is not possible. !e Time Trav - eler introduced some jargon, ‘the argument from the Grandfather Paradox.’ In this paragraph he explains what he means by that phrase, and he gives some further background for understanding his project. ? ??????
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