The next morning, Theo arrived early to school with a duffel bag. He began constructing small heaters out of aluminum cans, candles, and wire. By increasing the kinetic energy of the air molecules, the heaters would raise the room's temperature.
When students arrived, Theo explained his plan. "I've built one for each classroom. If we keep the doors shut, these should keep us warm for a few hours." The students were amazed and helped distribute the heaters.