New Evidence Is Challenging What We Know About the Deadliest Mass Extinction in HistoryMaddie Stone11/07/15 12:00PM
Was Earth's most devastating mass extinction caused by a single microbe?Alasdair Wilkins12/16/12 4:30PM
Extraordinary 298-Million-Year-Old Forest Discovered Under Chinese Coal MineJesus Diaz2/20/12 11:58PM
Massive Greenhouse Gases Killed the Earth Before and It Could Happen AgainKristen Philipkoski11/17/11 5:00PM
How massive volcanoes and supercharged greenhouse gases almost wiped out life on EarthAlasdair Wilkins1/23/11 4:15PM
