The per neter

In the writing

                    Proto cuneiform tablet

  It is the accepted fact in mainstream science and archeology that ancient Sumerians were the first to invent and use writing around 3350 bce. While also accepting the out of Africa theory it would beg to wonder why the origins of writing didn't develop in the birthplace of mankind noting the high level of civilization that existed in the continent during the same period in which it is said writing developed in Mesopotamia. That however is far from the fact, there exist evidence from Egypt to ancient Nubia of writing styles similar that coincides and even predates the oldest none Sumerian tablets 'the kish tablets' . In fact the writing used on the kish tablets aren't the cuneiform that we normally associate with Sumerian text but rather what archeologists call proto Sumerian/cuneiform or simply the ancient form that gave rise to the more complex writing. In ancient Egypt and Nubia there are also many examples of "proto hieroglyphic" and "proto Nubian"script and tablets dating back to 3300 bce. and older but such tablets are not given the same consideration.

Above you can see a fragment of one of the  many evidences  which gives an example of a early form of Egyptian hieroglyphics dating back to the 3rd millennium bce.

  Writing is a very useless way to track the progress and spread of early civilization. The spread of writing almost always coincides with the spread of advanced civilization. With the latest ancient writing being in the Americas and the oldest in Africa or as some claim Mesopotamia we can easily see the migration path of early man and how language followed. From all the clear archeological evidence which are too numerous to document in this one book it is not hard to see that language and writing developed in Africa and spread through Mesopotamia into Europe and also into Asia and finally the rest of the world. Archeologists maintain the notion that Mesopotamia developed writing first based on the usage they had of coins dating back to around 8000 bce. With similar symbols, while still accepting that the earliest proto cuneiform was about the end of the 4th millennium bce. They don't take in account the ancient Egyptian origin and the true age of the civilization may never be known seeing that a lot of Egyptian culture developed from cultures in the Sahara dessert that don't exist today lost to the sands of time. And to the fact that archeology in Sudan is not as extensive as it is in Egypt more evidence of the true age of these two cultures may never be known but they would most definitely challenge and change the modern view of history.