For many years, the account of the flood was considered to be simple legend, especially in view of its magnitude and, of course, the idea of a man keeping in a wooden ark pairs of countless animals. These features alone prevented the "scientific mind" to take the flood seriously as a whole.
But today we know two things:
many peoples around the world have kept a narrative of a flood of gigantic proportions;
we have proof of an event called The Younger Dryas that the scientific community believes has happened around 12,500 years ago.
This event, with all probability caused by the fall of a meteore, would have had such an impact on the whole Earth, making the waters rise for 120 meters. The civilization that there was before would have vanished almost completely and the narratives about the flood and those civilizations were recorded everywhere by the remainders of this natural disaster.
This last part is still a hypothesis on how and why inhabitants of the entire planet have decided to tell "a tale" of such an improbable and unconceivable event... but, not, it seems it is neither—although we still have a long way to go to confirm it and have firmer details about it.
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