The Nile as it was thousands of years ago

Psychic Edgar Cayce made three readings regarding the Nile River:

The Nile entered into the Atlantic Ocean. What is now the Sahara was an inhabited land and very fertile.

In the one before this we find again in this same land now called Egypt (this before the mountains rose in the south, and when the waters called the Nile then emptied into what is NOW the Atlantic Ocean).

In those periods when the first change had come in the position of the land, when the Nile (or Nole, then) emptied into what is now the Atlantic Ocean, on the Congo end of the country. What is now as the Sahara was a fertile land.

It turned out to be true. The space shuttle Columbia took radar images of the Sahara in 1981 and discovered that buried beneath the great desert, there once existed a vast system of stream channels, broad flood plains, and river valleys, some of which were as wide as those of the Nile. It confirmed what scientists had long suspected: this region was once wet enough to support plants, animals, and humans thousands of years ago. So why is it so arid now? It's because the Sahara originally dried out 2 million years ago at the start of the Ice Age, but brief rainy periods occurred about 200,000, 60,000 and 10,000 years ago. (You can also read an NYT article about ancient tribes living in the once fertile Sahara.)

So the Nile used to flow west and empty into the Atlantic Ocean. Why did it change course? Who knows? There is no evidence that the ancient and modern systems were once connected. Make your own theory.