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Pupil Size Is a Marker of Intelligence
(getpocket.com)
just science related topics. please contribute
note: clickbait sources/headlines aren't liked generally. I've posted crap sources and later deleted or edit to improve after complaints. whoops, sry
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It says in the article that the pupils enlarge with increased concentration. Perhaps more intelligent people are just always paying attention in new surroundings, where less intelligent people are more disinterested.