I have been watching your videos for quite a while and have learned a great deal. I appreciate the time and effort you put into making those videos, your products are also top rate, and you also recommend items in your videos. Recently you recommended Audel Welding Pocket Reference, I bought one! I had been welding zinc coated steel, and while I was aware there was a problem with that wasn't aware what it was, I was suffering with a sinus infection or so I thought and after reading that book, well part of it, I stopped welding zinc coated steel and recovered in a couple of weeks. I have now bought a new Lincoln 3350 PAPR helmet - a total game changer. Thanks so much just for that one potentially life saving recommendation.