i personally feel that only the mathematics group is active and all the other groups are pretty inactive. Can't anything be done so that all the groups reach the same level because people end up asking chemistry or physics questions in maths group...
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We're considering and trying different solutions. We have noticed the people asking non-math questions in math. For now, I'd say just ignore them -- unfortunately, it makes sense that they're asking in math so that they can get their questions answered.
A possible suggestion might be a "monitor board" of some sort or notification of question to certain groups beyond just the one you are in. I check in on the chem area from time to time but mainly sit in the math section as it is the most active.