Nerds vs Geeks

A nerd is one of those guys who is really studious, but still has a decent fashion sense and is clean.........a geek, not so clean, usually greasy hair, of course stays up all night playing Dungeons and Dragons or something similar and has no fashion sense. Usually seen at some kind of Con or Trek Convention (always in costume, and sometimes speaking Klingon).
Many times involved in the Society for Creative Annacronism (dressed as a Knight or a wizard, and beating up other geeks with a plastic stick)
I probably left some stuff out....but that is the basics.