1. Introduction In ‘The Paradoxes of Time Travel’ David Lewis (1976) argues that backward time travel is possible. However, it is not possible for a time traveller to change the past. This would lead to certain paradoxes, such as the Grandfather paradox. Were a person to kill their paternal grandfather before the birth of … Continue reading “Backward time travel entails too many foiling coincidences, in order that the time traveller not change the past, to be plausible” Do you agree or disagree and why?