I haven't been in them all. I check the homework ones mainly, then the general discussion and sometimes the classical physics, general astronomy/cosmology and software forums. Never gonna look at the politics subforum, cos that stuff is just boring IMO.
I've browsed all the major categories, but haven't gotten into all the subforums yet. Once in a while something catches my eye when I'm reading the index that lures me into a forum I don't usually explore. Sadly, though, what attracts me into a lot of those other forums are the complaints from the crackpots in feedback about locked posts; I'm too curious to not go look, and it's always worth it in sheer entertainment value!
After reading this post today, I decided to peruse some of the forums I never visit and try to read one post. I found an interesting one about microwaving, well, anything you can get your hands on, by Math Is Hard and Gokul in the Atoms, Molecules & Solids Forum. :rofl: But, then I just stopped. I couldn't talk myself into reading things like Number Theory. I've been following the development of the electric butter knife in the engineering forums too. Who knew buttering toast was so complicated! I'm awaiting pictures from the science fair. There have been a few other engineering threads that have caught my attention in the past, like trying to pump water uphill without a pump, or something like that. I have nothing to contribute to those threads, I just like reading along (I'm sure my answer of, get a couple of buckets, some good friends and plenty of beer, wouldn't have been terribly appreciated).