Most solutions require either the consent of the talker or that they not be present. For example, one solution is that the group splits into multiple subgroups, so that multiple people can talk at once- but there are ways for the talker to counter that, like abandoning their subgroup to join another subgroup (effectively merging the two) or asking people to keep to one conversational thread.
There's a broad blunt-subtle continuum of ways to communicate to someone that's they're dominating the conversation, and it generally seems best to use the most subtle option that they'll actually notice, but again, communicating to someone that they're dominating the conversation doesn't mean they'll stop dominating it.
There's a chance that the rest of the group really likes listening to the talker.
This thread is for asking any questions that might seem obvious, tangential, silly or what-have-you. Don't be shy, everyone has holes in their knowledge, though the fewer and the smaller we can make them, the better.
Please be respectful of other people's admitting ignorance and don't mock them for it, as they're doing a noble thing.
To any future monthly posters of SQ threads, please remember to add the "stupid_questions" tag.