duh...what?

Every once in awhile I'm reminded of how some things are just way over my head.

I was doing an interview the other day, and asked the candidate to describe her current project. The first couple sentences out of her mouth involved something about "P4 structures" and "perfect graphs." I must have sounded sufficiently confused, because she spent a good five minutes explaining (pretty well, considering my ignorance) what she was talking about.