Solid point. I realise I was unclear that for face shape I had in mind external influences in utero (while the bones of the face are growing into place in the fetus). Which would at least be a somewhat shared environment between twins. But nonetheless, changing my mind in real-time, because I would have expected more difference from one side of a womb to the other than we actually see between twins.
Even if I’m mistaken about faces though, I don’t think I’m wrong about brains, or humans in general.
Solid point. I realise I was unclear that for face shape I had in mind external influences in utero (while the bones of the face are growing into place in the fetus). Which would at least be a somewhat shared environment between twins. But nonetheless, changing my mind in real-time, because I would have expected more difference from one side of a womb to the other than we actually see between twins.
Even if I’m mistaken about faces though, I don’t think I’m wrong about brains, or humans in general.