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.
Darlings of the Cambrian Explosion, trilobites had spotted markings and sophisticated eyes. Some have been exceptionally well preserved as fossils, down to the level of individual cells.