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Silhouette of a person under an arch. (CC0)  Background: DNA.

Twelve Degrees of Separation: Do Human Haplogroups Lead Us to Adam or Perhaps the Adityas?

From the creation of Adam, until the birth of Noah (as a significant proportion of the world believes), there are eleven generations of his line; Adam, Cain and his brother Abel, Seth, Enosh, Cainain...