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In Season 5 of Stargate: SG-1, team member Daniel Jackson was briefly replaced by Jonas Quinn, a human from Langara. In addition to an optimistic, almost child-like curiosity about everything, Quinn shows numerous intellectual abilities above and beyond the average human. He can read quickly, remembers everything he reads or watches on TV (photographic memory?), and is even able to learn new languages abnormally fast. He often shrugs off his abilities, simply calling himself "a quick study".
Unfortunately, we never see much of Quinn's planet or nation, with other Langarans only appearing in a couple of episodes. Quinn eventually leaves SG-1 to return there, joining the new ruling council on his planet and hoping to unite his people. However, we never really hear any more about Quinn or the Langaran people after that.
Is Jonas Quinn typical of humans on Langara, or is he unique even there?