The largest factor in predicting group intelligence was the equality of conversational turn taking groups where a few people dominated the conversation were less collectively intelligent than those with a more equal distribution of conversational turn taking.

It is not simply the brightest who have the best ideas it is those who are best at harvesting ideas from others. It is not only the most determined who drive change it is those who most fully engage with like-minded people. And it is not wealth or prestige that best motivates people it is respect and help from peers.