"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."

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And to be fair, most documentaries are half an hour too long, anyway. Let's not kid ourselves. Most movies are an hour too long. I will say that the internet has changed everything in terms of distribution and because of iTunes and other outlets like that, length is no longer something you really think about, in my opinion. It's irrelevant.

— Nicolas Winding Refn