By Nicola Davis
Scientists have discovered the oldest physical evidence for life on the planet in the form of fossils in Greenland rocks that formed 3.7bn years ago.
The researchers believe the structures in the rocks are stromatolites – layered formations, produced by the activity of microbes, that can be found today in extremely saline lagoons in a few locations around the world.
The new fossils are 220 million years older than any previously discovered.
Continue reading by clicking the name of the source below.