Some have proposed child-raising co-ops as a solution. But co-ops work best in a close-knit group that shares key values. Which raises an obvious question: If a community’s values cannot sustain nuclear families, how likely are they to sustain much larger close-knit groups? More.

You know the story, mountain ranges formed, rivers changed course, islands formed, and other earth changes split populations into isolated parts which led to divergence, speciation and, well, the rest is history.  Given enough  read more