A 400 million year old fossilised fish skull gives us very early and previously unknown clues about how boney fishes evolved into the vertebrates we see today on Earth - including us humans.
Little skates that 'walk' across the ocean floor show how fish brains evolved to pave the way for working legs.
A drying climate caused a mass extinction among plants, but paved the way for the ancestors of modern reptiles, mammals, and birds.
If one venomous snake bites a mouse and injects venom into it, you can then feed that same dead mouse to another snake. The second snake won't die.
Taking the placenta as a case study, researchers are able to piece together how new organs evolve, by repurposing old tissues and using them to do new jobs.