First Oxygen Appeared On Earth Way Earlier Than We Realised

If you hopped in the Tardis and travelled back four billion years, you’d find yourself on a hot, miserable wasteland of a planet with nary an oxygen molecule to breathe. Earth used to be an asphyxiating hellscape, but over the eons, tiny green microbes filled the air with oxygen. New research finds they’ve been at it much longer than we imagined. Read More >>