Can We Really Travel Back in Time to Change History?

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Physicist Paul Davies responds to “Mr. Thursday,” Emily St. John Mandel’s short story about time travel. The charm of time travel stories is that the narratives are at once easy to imagine and yet preposterous. As a theoretical physicist with a lifelong research interest in the nature of time, I am often asked by people: Can it really be done? The short answer is, yes—in a sense.

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