I've noticed that, every once in a while, a MESE question becomes a HotNet Question, and then the visits, comments, and answers skyrocket. This most recently happened (is happening) with How to answer questions about the purpose of learning math?. This is great for MESE, draws in many new users. But I am just wondering how this happens, because traffic on MESE is generally ... tepid, and yet questions like that one suddenly take off. Is there some other forum that links to MESE questions? Or is it the case that many users "lurk," checking MESE regularly but only participating when an enticing question like the one cited is posted?