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.