A stop with Qwerty

What are you doing that requires exhaust ventilation?

Well, I was working with some solvents when I noticed they were peeling the paint off the back wall.

So I said to myself, “Whoa! That can't be good for my insides!”

Let me rephrase. What were you doing NOW that requires exhaust ventilation?

Beast from The Johns Hopkins University Applied Physics Lab patrols rooms with white walls until the batteries go dead. It then uses optics to look for a black socket on the walls and plugs in a special device. After charging, it continues patrolling © 1960