Oldest Traces of Life on Earth? Not So Fast

What were thought to be some of the oldest traces of life on Earth may not have been caused by life at all, new research suggests

May 28, 2014
9:00 AM EDT
Mounds of communal-living microbes known as stromatolites ruled shallow waters during the early days of life on Earth. The oldest and healthiest population today is found in Western Australia. | Rachel Sussman