A student dropped by the school’s computer lab and asked us if we could make lasers come out of the screen. He was very insistent about this being possible. I asked if he meant supermarket scanning lasers. He said no, the kind that damages your eyes, and also they move around. We were wondering if this was a clever engineering question, but finally he said his sister’s computer could do it. One of us realized he was talking about one of the Windows screen savers.
