Homogeneous groups have shown to be better able to get along, but it comes at a cost: they are less creative. This even applies to the social groups you keep, so beware of being surrounded by people who are too similar all the time, you may end up in a creative echo-chamber.
I found that you won’t notice this until you get out of the echo chamber.
Creative people thrive on having others impacted by their ideas.
Obvious, but always a good reminder. Great overall list