The evolutionary story of extinction and the rise of dinosaurs faces challenges, but survives when the glue of imagination holds fragmentary evidence together.
Some material that flaked off a fossil in Alberta was not stone; it was dinosaur skin. Discoverers were excited and puzzled: how could it last so long?
One might think that 154 years after Darwin's book about it, natural selection would be empirically obvious. The journal Nature went on a search for it in DNA.