Evanston is foggy tonight. Visibility is about 20 feet, max. It was a slightly overcast day, but I didn't expect fog to roll in. Except it did, after I left GSW.
And one cool thing about fog: each particle of water reflects light. So what I did, I took out my laser pointer. Usually, laser pointers have invisible beams, because there isn't enough energy or something. There are ones you can get with a visible beam, on ThinkGeek for example, and I think they use four times more energy than normal pointers. Well, one thing this fog is good at: reflecting light. Whenever my laser points into the fog, I can see the entire beam. Now that is cool.