In The Time of Dinosaurs

"Some kind of real-life Jurassic Park." Prince Jake speculated. "Maybe someone actually did it. You know, cloned DNA from old dinosaur bones."
<That is scientifically possible,> I said. <But I have been feeling a strange distortion in my time-keeping sense. This planet is no longer rotating at the same speed as before. I think the likely explanation is that we have traveled a very, very long way in time.>