There are heaps of books on body language. One thing thats often concerned me is that some people say to stand with your head up and be assertive if you want to avoid aggression, whereas others (and in the military when you are held captive) you're often told to be subserviant in order to avoid aggression. I think it comes down to the psychology of the other person sometimes (i.e. if they feel threatened by you and they are prepared to kick your arse they will, otherwise they will back down).
Ian
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