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I realized there is no tag about soft-matter, the branch of condensed matter / statistical physics. Would be great to add it, isn't it ?
Yeah, but you don't have to ask on meta to create a tag. Just put it on a few questions. (Ones where it belongs, of course.)
If you find a fair number of questions that belong to the topic, sure, go ahead! To create the tag just add it to the questions. (if there are many such questions don't do it all at once to avoid flooding the main page)