I asked AI: "Could "Six Degrees of Separation Theory" work on kinship (and the fact that we are all cousins?")
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AI:
The "six degrees of separation" theory absolutely applies to human kinship, and mathematically, it actually takes fewer than six steps to connect anyone on Earth to a common cousin.
Here is how the science and math of human connection break down.
The Math of Ancestry
Every time you go back one generation, your number of ancestors doubles.
1 generation ago: 2 parents
2 generations ago: 4 grandparents
3 generations ago: 8 grandparents
4 generations ago: 16 grandparents
10 generations ago: 1,024 ancestors
30 generations ago: Over 1 billion ancestors
Because the global population 30 generations ago (around the year 1100 CE) was only about 300 million, it is mathematically impossible for all your ancestors to be unique. Paths must cross. This overlap is called pedigree collapse, meaning everyone's family trees are highly interconnected webs.
The Identical Ancestors Point
Geneticists use statistical models to find the point in history where every single person alive shared the exact same pool of ancestors.
Global Connection: Research suggests the Identical Ancestors Point occurred just 2,000 to 5,000 years ago.
The Meaning: If you select any two people on Earth today, they share a common grandfather or grandmother from that era.
Universal Cousins: This makes every human on the planet at least a 100th to 150th cousin.
Fewer Than Six Steps
While the "six degrees" theory states any two people are connected by six social acquaintances, genetic kinship is even tighter. The
Genetic Network: You do not need a chain of friends to connect you to a stranger.
The Shared Relative: You only need to trace upward to a shared ancestor and back down to the other person.
The Result: In terms of biological genealogy, you are rarely more than a few dozen generational steps away from anyone, and socially, your most recent common ancestor links you into a massive global family.