Interesting thread. I wonder if the original motivation towards the west was:
Was the west so great, or perhaps it was just that the east (or mid-east) was not so very great?
Concerning Europe / migration: If you partake of the radiation theory out of Africa, once one clears the meditteranian/black sea, consider the joy one would feel, contemplating the west and the open opportunity (neanderthals aside) that the vistas of the west would present...
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