You're all mostly talking out of your ass. A study in Britain found a cuckoldry rate of 1.3% per generation ( http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1288207/ ). At 40 generations of 25 year average length, i.e. 1000 years, there's a 60% chance of being the descendant of your supposed 1000 year old ancestor.
More: http://blogs.discovermagazine.com/gnxp/2...opulation/
"I don't understand family trees. Since when you go back about 200(?) generations - you have more relatives than there were people alive."
Because at some point, your grand*8-father was fucking your eighth cousin.
More: http://blogs.discovermagazine.com/gnxp/2...opulation/
"I don't understand family trees. Since when you go back about 200(?) generations - you have more relatives than there were people alive."
Because at some point, your grand*8-father was fucking your eighth cousin.