The Octopus: Smart, Dumb, Other?

I've been pretty quiet on the blog while I've been off visiting grandparents in other states this past week. But in the meantime, Slate has published a piece I wrote for them on the beguiling mystery of octopus brains. I wonder if this guy would find it enlightening. Update: A couple readers pointed out to me that I should have said octopuses jet water, not air. Sorry for the slip--it should be fixed shortly.