Well (this is background information), I've recently been trying to learn how to understand body language (reading books on the subject, observing people more closely, trying to rationalise why a person's body would behave a certain way).
Yesterday, I was at a university tutorial. There were only three people there (myself, one other student and the tutor). Now, whenever the tutor was speaking to or looking at me, he would be making gestures with his hands in order to help communiate his point (as people often do). However, when he was speaking to or looking at the other student, instead of his hands being used as tools of communication, they would often be touching his face, or else hanging awkwardly at his side.
Face-touching is, I have read, an almost universal method of self-pacification that people unconsciously use when they are nervous (I've since realised just how often I do this myself, when before I didn't know about it at all).
So, what I had done here, in this situation, was realise that my university tutor was made nervous by speaking to this student through observing his body language! What a breakthrough!
(I can only speculate, of course, on why he was uncomfortable speaking to this student when he seemed not to be with me)
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What is the time where you live right now?