Wood heat is not new. It dates back to a day millions of years ago, when a group of cavemen were sitting around, watching dinosaurs rot. Suddenly, lightning struck a nearby log and set it on fire. One of the cavemen stared at the fire for a few minutes, then said: Hey! Wood heat! The other cavemen, who did not understand English, immediately beat him to death with stones. But the key discovery had been made, and from that day forward, the cavemen had all the heat they needed, although their insurance rates went way up.