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If you're lucky enough to be in some group for some reason, listen to what people are talking about. You can later go up to someone and say: "Listen, I heard you talking about X. Could you tell me more about it?"
Works especially well at lectures or scientific conferences :)
Get a hobby where you socialise and have an excuse for that. Like photography. Get a proper camera with changeable lenses, none of that cheap soap box look. It's nice to ask a person if he/she doesn't mind you taking a few pictures of her. He/she will usually strike some fairly uninteresting pose, so to ...
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