Paleontologists have found the oldest heart on Earth, which is 380 million years old.

In the Gogo Formation in Western Australia, paleontologists have found fossils of an arthrodire, an ancient armored fish. Scientists were able to see the insides: intestines, liver and heart. It became the oldest ever found on Earth - it is 380 million years old. Paleontologists using synchrotron X-rays built a three-dimensional model of a fish found in a limestone block.