Hello all, I'm Juan from Mexico, currently a Physics student. Just until a while ago (just a couple years, when I decided to go for a science career) I thought scientific communities were either left closed for all but a few scientist running very specific and technical discussions (not meant for mortal men) or being run for elementary-secondary students with rather basic level topics. Quoting Thorin Oakenshield (P.J. version) I've never been so wrong in all my life. I lurked a little this community, very little indeed before realizing it has open door for people from curious folks to well known scientist, in between and beyond, which is something I did not expect. With this in mind I can only say now, thank you all who share their knowledge with anyone willing to pay attention, and sure I hope to complement what I get from college with you all. Glad to be here.