a liquid accelerant does. >> people have said, oh, the whole house caught fire from one end to the other in under five minutes. somebody must have poured gasoline. it's not true. you flash over one room and very quickly your house is involved. >> flashover could also explain the furniture being consumed. >> following a post flashover fire, what you expect to see is tables, chairs, couches, all of it reduced to charcoal. it is very common for fire investigators to work on the premise that the fire was too hot or too fast to be a natural fire. in other words, the idea that only an accelerant can generate enough heat to destroy a heavy dining room table. >> but as this other fire investigation experiment shows,