What are the key differences between a postage stamp and a revenue stamp, and how are they each used in their respective areas?
What are some of the most famous or iconic stamps in history, and what stories or controversies are associated with them?
How does the process of designing and issuing new stamps work in different countries, and who typically decides on the subjects and designs?
What factors determine the value of a stamp in philately, and how can collectors identify rare or valuable stamps?
How are commemorative stamps different from regular issues, and what events or themes have been traditionally honored on commemorative stamps?
What is the history and origin of postage stamps, and how did they evolve over time?
What are some notable trends or themes in stamp design and issuance in recent years?
How does one determine the authenticity and condition of a stamp when appraising a collection?
What are the different types of stamps available, and what purposes do they serve (e.g., commemorative, definitive, airmail, etc.)?
How did the use of stamps revolutionize the postal system in the 19th century?
