 So I love teaching S-P-I-E classes with S-P-I-E. It's so fun and the organization is really great. They do all the support, all the work. I don't have to do a thing. I just show up and teach my class. And the classes are always really well organized. The students are always really engaged. It's just delightful. It's about the best teaching experience you'll get. So I've been doing it now since 2005. It's been a while. And I originally was recruited by S-P-I-E to come teach one of my classes. I'm really a standards guy. I'm an optical design and specifications. So because of the standards work, S-P-I-E really wanted to improve our outreach and getting those specifications and standards better known in the industry. So I kind of got pulled into it from that direction as kind of just doing something that needed to be done. And now I just love it. I do it all the time and I think it's just great.