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We think we understand the laws of physics.



We think a lot of things. It was perhaps inevitable that some of them would turn out to be wrong.



When the great incursion occurred, no one was prepared. Of all the things physicists had predicted, "the fabric of reality might rip open and giant monsters could come pouring through" had not made the list. But somehow, that was precisely what happened.



For sisters Susan and Katharine Black, the day of the incursion was the day they lost everything. The...