And it could shed light on our distant evolution. Says the co-author of a study on the fossilized organ: "We are all related, in the most literal sense." Professor Kate Trinajstic inspects a fossil of an ancient fish at the Western Australian Museum. Curtin University A 380 million-year-old fish heart found embedded in a chunk of Australian sediment has scientists' pulses racing. Not only is this organ in remarkable condition, but it could also yield clues about the evolution of jawed vertebrates, which include you and me. The heart belonged to an extinct class of armored, jawed fish called arthrodires...