Common body language mistakes and how to avoid making them (with Blake Eastman)

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What are some common techniques for quantifying body language? How hard is it to identify poker "tells"? Are there any facial expressions or body movements that have universal meaning? What can be discerned about group dynamics just from watching a meeting over video call? What are the most common body language mistakes people make when going on dates or trying to make friends? What are the strongest indicators of charisma? How do people signal their social status? What are the most effective ways to deal with trolls? How valid is the concept...