A team of researchers in South Africa put a bit of rock under a microscope and found the remains of 3.42-billion-year-old life. Those fossils—the squiggly, microscopic remains of organisms that subsisted on methane—broaden the scope of what habitats were suitable for life on Earth during the Archean Eon.
Source: Gizmodo – These Squiggles May Be Some of the Oldest Fossil Life on Earth