Fossils in rocks that are 3.8 billion years old have puzzled biologists as they look nothing like modern cells, but now it seems they may be an ancient precursor life form that was unable to control its structure Fossils in rocks that are 3.8 billion years old have puzzled biologists as they look nothing like modern cells, but now it seems they may be an ancient precursor life form that was unable to control its structure New Scientist – News