an enthusiastic professor gestures expressively while explaining a complex theory to a student sitting across from his desk. The professor points to diagrams and references multiple thick books spread open around him. What started as a simple question has turned into an extensive, detailed explanation covering many aspects of the subject. The student listens intently while taking notes as the professor continues his comprehensive discussion. Bookshelves filled with academic texts create a scholarly atmosphere around them. someone speaking at length and in great detail about a subject