That is one of my favourite comments of all time. About 6:10 in. "What could I tell this lady that wouldn't completely freak her out." I have paraphrased and used that on the front page of my website
http://dlpi.weebly.com/. I've also built a very remedial rocket stove that makes charcoal. Too many bad cuts and leaks, the metal is disintegrating and it's not producing enough heat, but it proves that even very small systems can work.