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I read about them elsewhere; one of the details I remembered is how at some point they started noticing fast-moving "stars" in the night sky and the father realized they must be man-made artificial objects (satellites).

The most interesting bit about this to me is, how fast the daughters developed their own language without intention.

also https://wikipedia.org/wiki/Nicaraguan_Sign_Language

(nicaraguan sign language)

They were Old Believers! I've heard of this story before but never picked up on that facet. There's still some living in settlements in Alaska.

This was a very nice and fascinating (although strange) read with my morning coffee. Thank you for sharing.