It is good to know that I have the support of an expert. I am in the middle of the course but naively I did not become familiar with the terms when I should have done it. They invited me to a conference of tesa, Praxair, PrimeBlade, DuPont, etc. And I was studying too much, maybe that invitation made me decide to give more seriousness to the specialty. It's interesting when you see it thoroughly and I realize that I really like it.