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Ok, so this really has no impact on the story whatsoever, but it’s been on my mind. In Oathbringer, Jasnah reveals that Roshar originally belonged to the listeners, and that humans eventually invaded. Someone (I think it was also Jasnah, though it might’ve been Odium) said that Shinovar was given to the humans as a place where they could live in a similar environment as their native one, where the humans plants could grow and they could thrive. Most obviously moved on from Shinovar, and settled elsewhere. However, if Shinovar was the equivalent of their Rosharan homeland, then why are the Shin short compared to everyone else? Seeing as the Shin would have no obvious catalyst for a significant change in stature (their environment was the same on Roshar as it was before Roshar), the other Rosharans would have had to have grown in order to adapt to their new environment, though the reason they would need to adapt why remains a mystery to me. A second theory is that before leaving their previous planet, the humans had different nationalities, and this carried over when they took over Roshar. This theory seems the most likely, and would explain why the people in the homeland are comparatively short, as they wouldn’t accurately represent the entire pre-Roshar population. Another possibility is that the different countries were founded by a few people, and the different genes carried through generations. This theory makes less sense, however, as the humans probably had to fight the listeners in order to take over Roshar, and that couldn’t be done by a few people, meaning that a few peoples’ similar genes couldn’t control the genes of the whole country.