The different species of barbels in Lake Tana in northern Ethiopia have evolved from a common ancestor. When biologists from Wageningen University first described the fifteen species over twenty years ago, it was not yet ...
Oct 09, 2015 in Ecology
A new survey of Lake Tana in Ethiopia the source of the Blue Nile suggests that drought may have contributed to the demise of the Egyptian Old Kingdom, around 4200 years ago.
Jul 12, 2011 in Earth Sciences