The bones were the same, nothing had changed. But people started to look at the dinosaurs differently. Same fossils. New ideas... People keep forgetting that paleontologists are really limited. We have a bunch of bones and teeth — for the most part — to work with. So really it's the ideas that drive the science. The ideas, of course, are driven by the biases of that particular moment. So we went from a lizard bias to a bird bias, and now the pendulum is actually swinging, once again, back to the middle.