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Teranesia by Greg Egan
I read this immediately after Adventures in Time and Space... and they both talked about superposition, eigenstates, and the Many Worlds Interpretation. Otherwise, they were very different books. A boy on an island with his scientist parents and infant sister is caught in a civil war. Both parents die and he must save his sister. He does, but with many guilty feelings and when she opts to go back to the island to investigate genetic mutations that seem similar to what their parents were studying, he follows her. I didn't completely buy his rationale for guilt at the end, but it was still a moving book with war, science, and relationships all served.