I have often wondered on what, where and when did civilization really started. I mean is it not weird that it suddenly appeared in certain points of the globe with such complex development apparently out of nowhere?

Take the flood myth which most westerners such as me have known mostly from the bible, it is spread throughout many cultures that give little to no credit to the bible. And since the 1980's to the present decade submarine ruins have been found in coastal areas which some have credited as being as old as 10000 years! Such is the case of the submerged Yonaguni ruins in Japan.

Of course every time any such claim is made a scholar appears () who redily says its bs.

One of the doubts I have is related to cultural interchange between the old civilizations, in the East there are plenty sources that suggest/prove that the early chinese and indian valley cultures had contact with other unknown and known cultures.