A longtime NASA employee has one of the strangest -- if not the strangest -- job at the space agency, working there for the last 38 years as a professional smeller.

George Aldrich's job is to smell things before they go into space, which is necessary because since there's no fresh air available in a space station, for instance, odors can linger there for years.

The kind of things Aldrich typically smells include  books, hats, glues and watches, as well as specialized space equipment.