There was an experiment on behavioural psychology performed on kids, in which a group of children were told on different days that those with particular eye colours were better than those which other eye colours for that day. I'm not sure how it was reinforced, but the attitude change was immediate. But the most disturbing thing was, during academic activities the "oppressed" groups would perform less well and require more time to finish, an effect that disappeared when participating in the other side of the experiment, or not participating at all.
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