Also, if culture is wired on a biological level into the human brain, then it's fluid.

I remembering reading a meme about 'third culture kids,' linked by a friend who spent years living in first one country, and then years in a second country (and then worked and lived in a third!). It was about the unique mish-mash of adaptive behaviours that third-culture kids share in common with each other, because it's such a strange thing to live deeply in one culture and then another! http://www.buzzfeed.com/regajha/31-signs-youre-a-third-culture-kid