I think that is visible from orbit that Engrish is not my mother tongue. Not so clear. Take in consideration that these first civilizations appear just after long cold period. Climate was very different in this age,big part of planet is still under ice. Lepenski Vir have unique micro climate conditions. Also there is rare phenomena, natural water whirlpool which push boat from shore, then back it to the shore. This allow even most primitive boats to safely fishing. Big advantage for surviving in this time. "Civilization has a clear and direct spread from the fertile crescent area." Yap... but what is with metallurgy, the beginning of plants cultivation, the beginning of animal domestication, literacy, wheels, etc. Like I say, Academia try to locate beginning of civilization on Middle East, because of .... reasons. For god sake we actually don't know in which century we live for sure. There is big probability that 'error' is 200 -300 years. Nope, Alexander can't cut such knot... At least without more powerful tool than sword. However, we probably never know for sure. History is 'compromise' many interest are involved, and in such cases, no one give a fuck about truth.