Rouge Chalk

There's this weird thing that happens in my math class when my teacher erases the blackboard. Rouge clumps of chalk powder travel straight down the board at a constant(ish) velocity and pick up chalk residue (from previous erasing), leaving a vertical dark line. I wonder why It does that.

This last weekend was really terrible in some ways, but good in others. I stayed up late every night, came down with a runny nose, and "forgot" to do my laundry. But that's ok, because I learned that those things arn't as important as preparing for tests, or doing important homework. That's the thing about college. If you let the little things get too important, either you'll lose on the big things, or you'll go crazy trying to do everything. Sometimes its ok to let a little online quiz go if it means you'll be less stressed that night, or you can focus on one big test coming up, or a more important assignment. There's more to priorities than "do homework, do it now". You have to take care what really matters.

So I was going to post the answer to the weird phenomena in the first paragraph by quickly searching Google for the answer, but it wasn't anywhere to be found. (easily) But that's the best part! I don't know the answer. It's almost like the tiny chalk bits are attracted to other chalk bits, and if enough get close together, they fall and pick up the ones on the way down. I'll tell if I figure it out, but so far, its a fantastic mystery.