Kvothe

“How would you bring a kettle of water to a boil?”

Looking around I saw a large boulder by the side of the road. I pointed.

“That stone should be warm from sitting in the sun. I’d bind it to the water in the kettle, and use the heat in the stone to bring the water to boil.”

“Stone to water isn’t very efficient,” Ben chided me. “Only about one part in fifteen would end up warming the water.”