OK...Gerard and I were just spooked by a low rumbling...and it wasn't thunder or a truck--it lasted far too long. What it sounded like was what airplanes taking off from Midway used to sound like from our house, before all those noise restrictions were put in years ago. From our parents' neighborhood, we could hear the roar of the planes whenever they were taking off to the southwest. It was a low rumbling. It was weird...so now I'm turning off my computer, because things are getting weird...and I don't want my CPU zapped if there's a lightning strike. :)