The human mind is both brilliant and pathetic. We have mastered fire, created democratic institutions, visited the moon and deciphered our genome. Meanwhile, each of us makes mistakes every now and then, sometimes irrational, but more often simply due to ignorance. Why do we often think we know more than we actually know? Why are political views and false beliefs so difficult to change? Why do individual-centered concepts of education and management often fail to produce results? All this (and much more) is explained by the deeply collective nature of intelligence and knowledge. In collaboration with others, our minds allow us to do amazing things. True genius can be seen in the ways we create intelligence using the world around us.