Scientists discover the remnants of a 3.5 billion-year-old ecosystem

In a discovery that could influence the search for life on other planets, an international team of researchers working in Western Australia's Pilbara region have uncovered evidence of complex microbial ecosystems dating back 3.5 billion years. That's 300 million years earlier than previous finds. » 11/12/13 8:40am 11/12/13 8:40am