Steve Olson's book Mapping Human History
traces the history of the species since its origins in
Africa. Olson and his colleagues have found that if
date back more than a little ", about 5,000 to 7,000
Yesterday, today everybody living today has exactly the same set
ancestors. In other words, any person
I live in that time is either an ancestor of all 6.5 billion
people living today, or their line died out and have
leaves no residuedescendants.
A mathematician. Each person has two parents,
four grandparents, eight great-grandparents.
Keep doubling back through the generations - 16
32, 64, 128 - and within a few hundred years
have thousands of ancestors! It is nothing more
exponential growth combined with the facts of life. From
Century 15've got a million ancestors! With
13 has one billion! About 9 º
century, only 40 generations ago,a higher number
billion.
How could anyone alive today have had a trillion
ancestors living during the 9th century? The answer
ie they did not. Imagine there was a man alive 1200
years ago whose daughter was your mother's 36th
and great-grandmother, whose son was your father
36th great-grandfather. That would put in two
branches of your tree. In fact, most
people who lived 1,200 years ago appear not twice,
but thousands of timesour family trees, because
there were only 200 million people on Earth after
(Edgar Cayce readings had been 133 million
people on Earth as soon as Atlantis) A simple division.:
a trillion divided by 200 million programs
average, each person, then it would seem 5000
Sometimes the family tree of every person living alone
today.
But things are never average. Many people
who were alive in the year 800 there was nochildren;
tree does not seem to be anyone in the family. Meanwhile,
most prolific members of society reveal
many more than 5000 times in a lot of trees to people.
Go forward in time, and there are fewer
people willing to put more branches
6500000000 family trees of people living today!
E 'mathematically inevitable that at some point,
There will be a person who appears at least once in
all trees of the family. "Ifthey entered a village
on Earth around 3000 BC, the first person
probably would have found its ancestor "
Jotun Hein wrote at the University of Oxford, England.
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