Dave and I once got talking about all those doppelgangers a while back. 
Both of us keep seeing pairs of people who are sooooo similar. For years we’ve been seeing it. Repeatedly meeting people who look like an old teacher or customer or boss. And not just their facial structures, but often their voices, body language, personalities or even preferences in humor or mates are similar.
People don’t just have types. 
We ARE types.
The Greeks and Turks started a race war 1,000 years ago. Nobody can tell them apart anymore. Ten centuries of rape, clandestine traitorous affairs and fighting have turned them into each other.
Perhaps skin color, race, really is all surface and changeable for dealing with sun and humidity, while features like pheromones, skeletons and minds are more stable. That might explain why sometimes those doppelgangers … are different races, or even different sexes!
Joan and Rojer from “Mad Men”
Particular collections of those more stable traits might only produce so many combinations. Dave and I guessed 700.
He looks like Giovanni Ribisi or Macklemore. I’m like a poor girl’s George Clooney.
A couple of old friends from Montie House, 1987.
People can only keep track of about 150 types of people in their Ka. If there are substantially more than 150, it would feel the same as 10,000 or a million or a billion types; way more than we can possibly deal with. 700 is about three times the maximum which is plenty enough to feel infinite.
“Separated at birth celebrity lookalike” in Google will find dozens of examples that you may already be familiar with.
Then, just a few years ago, The Human Genome Project made a fascinating discovery; humanity went through a genetic bottleneck, about 70,000 years ago. Humans nearly died out, possibly because of the Toba Supervolcano.
Humans were reduced to about 700 breeding pairs, or 1400 Prototypes. Our theory is that colors come and go but muscle, bone and even some processing preferences are less plastic.
Our entire population has less genetic diversity than any 12 randomly selected oragatans.
We’re keepin’ the original name:
The 700 Prototype Theory
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