This is a great read for anyone interested in evolution and/or psychology. Go check this guy out.


Humans have been living in large complex groups for millions of years, and flourishing as a result. This social environment has shaped the course of our evolution as much as any natural one, in particular how our psychology has evolved. For example, humans are highly susceptible to peer pressure, likely to ensure we do what the group wants and so don’t risk being thrown out of it. A human going solo would not survive for long (Hawkes et al., 1991).

Now new research has identified yet another aspect of human psychology that seems to have evolved to help us deal with living in social groups: dividing the world into an in-group and an out-group, and working extra hard to curry favour with the former. Although the habit of humans to break the world down into “us” and “them” has been known about for years (and often blamed for many sources…

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