World’s oldest heart found in 380-million-year-old fish

Researchers from Australia’s Curtin University discovered a 380-million-year-old heart preserved inside a fossilised prehistoric fish, claiming it to be the world’s oldest heart. The researchers also found fossilised stomach, intestine and liver in the ancient jawed fish. The discovery is remarkable as the fish’s soft tissues were rarely preserved, said lead researcher Professor Kate Trinajstic.