The lights went off at three o'clock. The photocopier stopped mid-page, the air conditioner went silent and the computers shut themselves down with a beep. "Again?" someone said, staring at a pile of uncopied handouts. "We have some battery-powered lights, "said the boss," but if your students can't see, tell them they can either have the lesson in the pub or come back another time. It's Ukraine, they'll understand."