I see! So, it is now my turn to ask a stupid quetion. Perhaps this question:
Suppose I make an upside down family tree. I appear at the top, my two parents below, their parents are shown below that, etc. etc. Then at the nth place there are 2^(n-1) people. But for n = 34 this exceeds the current World population and 34 generations back there were far fewer people than there are today. So, what is wrong?