Someone who studies science. [ Not to worry, he knows that's not enough information, he's just getting rice on a plate. ]

Science being subjects like biology, which is the study of living things, physics which is the subject of matter and everything around you, chemistry which involves the composition of different items. Each one branches off into several sub-specialties and while most people choose one and stick with it, I spent a great deal of time studying all of them.

[ He just didn't have any other interests really... ]