Very interesting! If I didn't misread, a better title would be "In 3000 years almost everyone alive today will be a common ancestor of all humanity." From the

Very interesting! If I didn't misread, a better title would be "In 3000 years almost everyone alive today will be a common ancestor of all humanity." From the story: "In fact about 80% of the people at that time in the past will be the ancestors of everyone in the present. The remaining 20% are those who have had no children, or whose children have had no children, and so on - in other words, people who were genetic dead-ends." This puts a whole new perspective on the often quotes statistics about Genghis Khan's progeny.