At Raytheon, I work with people who design and build Radars for a living. The "Technical Seminar Series" is a learn at lunch format meeting where several of the hard-core nerds discuss whatever technical subjects they find interesting. We generally can't say much about what we do during business hours outside of work, but it's fun to talk about stuff we read or did over the weekend.

The intended audience is very technical, but the general tone is intended to be more fun than scholarly. There are lots of pictures and portions of the text may even resemble English.