https://www.youtube.com/watch?v=YhcXWfHfkBc Dr Seyfried speaking clear…Money making things Scan it, research it and prove me wrong Harvard, Yale, Oxford, etc.@tnseyfried does not propose Zinc. I do. J. Ramirez (Industrial Engineer Chihuahua Tech) Sorry Oxford, simpler explanation.? If you keep the zipper closed you cannot copy it.