I think there exist records of hospital mix-ups with babies, with pretty profound differences changing them depending on what environment they wound up in, but

I think there exist records of hospital mix-ups with babies, with pretty profound differences changing them depending on what environment they wound up in, but this may be mostly anecdotal. One case in Japan like this but it illustrated wealth difference as opposed to what we're looking for here. http://www.telegraph.co.uk/news/worldnews/asia/japan/10481091/Japanese-man-born-to-wealthy-parents-is-accidentally-switched-at-birth-and-endures-life-of-poverty.html http://www.telegraph.co.uk/news/worldnews/asia/japan/1048109... Provocative but not evidence. I did look up some twin studies but I can't find one with a clear vice/virtue environment study. Gwern is good at ferreting out this kind of information if you ask him.