Here’s the second in my series of sketchbook videos exploring the theme of “critical thinking and tribalism”. In this episode I focus on the epistemic dimension of our tribal nature. I talk about how social survival strategies played an important role in the evolution of our distinctively human intellectual capacities, by increasing our storehouse of knowledge and skills via the development of CULTURE. I also show how one of the consequences of our socially distributed knowledge is that we're prone to OVERCONFIDENCE about our own personal knowledge.