Yeah I thought there were a few along the same lines. I think I've even read one a while back.
I'll have to see if I can remember it.
Along those lines, I wonder how long it would take for people to become different. Obviously evolution would be a slower more subtle process, but thinks like change of height, weight, gait, and many other things could change in just a few generations with differences in gravity, light, temp, etc. Just the way people live even and how they face their challenges.
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