Thanks, but sometimes,- or generally there are differences, which building materials are locally available. And what´s most important is: Seeing is believing, so a workshop on rocket mass ovens in the neighborhood would be great! I plan to participate in a workshop on rocket stoves soon here in Berlin.
It's a pleasure to see superheros taking such an interest in science. And this tiny ad:
Experience months or even years of natural building and growing your own food
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