Actually, there are examples of "one off" events in early human history, such as the migration out of Africa by a subset of the ancestral human population some 50,000 years ago.
According to Nicolas Wade's fascinating book "Before the Dawn" (yes, the same Nicolas Wade from TFA), all the genetic evidence points to a single band of maybe 150 people leaving the rest of the ancestral human population behind in Africa, and populating all the rest of the world. Of course, the natural question is, why didn't other
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