The study questions the long-held belief that northern Africa became arid around 3 million years ago, which coincides with ...

Object Details Author Gurche, John Contents Beginnings : Sahelanthropus tchadensis (6 to 7 million years ago) -- Walkers and climbers : Australopithecus afarensis (3.6 to 2.9 million years ago) -- The ...

John is Ars Technica’s science editor. He has a Bachelor of Arts in Biochemistry from Columbia University, and a Ph.D. in Molecular and Cell Biology from the University of California, Berkeley.