re: Study: All Humanity Comes From One Couple.................... You don't say

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It comes from not understanding the modeling. If you have a predetermined year total with a predetermined population on both ends of the graph. All you have to do is pick a formula that resembles the curve and adjust the last remaining variable.

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Sounds like someone has done some modeling in his history.

You can create a formula to reproduce any data points you pick - and it should be relatively accurate for the point in between those if you are dealing with some physical characteristic not influenced by significant random events - but they are generally worthless for predicting behavior outside the limits of the original data - and the farther removed from the original defining points the worse they become.