The Great Dinosaur Debate
We humans have been digging up dinosaur bones for thousands of years. But it's only in the last few centuries that we have recognised them as the bones of dinosaurs.
Only just lately have we understood that birds are dinosaurs. Indeed, it was only as recently as the 1980s that we began to understand how a small asteroid was involved in the extinction of the dinosaurs (at least, the ones that were not birds).
Illustration by Douglas Holgate (Dinosaurs Aren't Dead, Pan Macmilan 2010)