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A 380-million-year-old heart, the oldest ever found, coupled with a separate fossilized stomach, intestine, and liver were found in an ancient jawed fish, providing new insight into how our own bodies have changed through time. The newly discovered anatomy of arthrodires, a class of extinct armored fishes that flourished between 419.2 million years ago and 358.9 million years ago, is similar to that of modern sharks, according to new research that was just published in Science. This discovery provides crucial new evolutionary clues. Given the rarity of finding 3D preservation of soft tissues from ancient animals, lead researcher John Curtin Distinguished Professor Kate Trinajstic of Curtin's School of Molecular and Life Sciences and the Western Australian Museum said the discovery was exceptional. As a palaeontologist with more than 20 years of experience studying fossils, Professor Trinajstic stated, "I was absolutely shocked to see a 3D and wonderfully preserved heart in a 3...