"I mean," said Cavendish, "obviously, it's a far, far better thing that I do than I have ever done. Obviously . But I don't even get to enjoy the sensation of having done it. And now here I am." The old lady next to him on the bus shifted in her seat. "Do you think you could explain it to me again?" she said. "I fell asleep for a while there." Cavendish sighed. "It's so hard to explain," he said, resting his head in his hands. "Or to know where to begin. I'm not entirely sure what happened myself. In the first place, my partner and I—we're time travelers, you know." "We get a lot of you here." "Anyhow, my partner an...