If you want to know what I think about the other chapters in this book click #sciencefictionandphilosophy
Bradbury's story is set in the near future where a company sells Safaris into the past for people to kill dinosaurs! Safaris are carefully organised to not create time paradoxes.
Sider's essay discusses two views on Time. Time Flows and Time is like Space. The essay ends with a reference to the Back to the Future movie which "fails miserably" as a work of Philosophy as it is full of paradoxical holes. Sider considers Terminator 1 a much better movie because it never contradicts itself.

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