Ever notice how hot it gets inside a compost pile?
An inquisitive John Kimberlin did, and asked, "What if I could speed up the process by producing more heat?" He piled horse manure and sawdust on top of a couple of charcoal briquettes. Then he put a hair dryer to it and it burned hotter. He kept increasing the size of his experimental fires and found he could make it burn from the bottom up, inside out - increasing the heat - creating a tornado of fire, of energy contained within, like a forge.
The Result -