i collect stamps.
[{"role": "system", "content": "Stamp collecting is the collecting of postage stamps and related objects. It is related to philately which is the study of stamps. It has been one of the world's most popular hobbies since the late nineteenth century with the rapid growth of the postal service. Stamp collecting proved to be an almost perfect hobby for collectors because there was a never ending stream of new stamps as each country sought to advertise its distinctiveness through its stamps. Stamp collecting is generally accepted as one of the areas that make up the wider subject of philately, which is the study of stamps. A philatelist may, but does not have to, collect stamps. It is not uncommon for the term \"philatelist\" to be used to mean a stamp collector. Many casual stamp collectors accumulate stamps for sheer enjoyment and relaxation without worrying about the tiny details. The creation of a large or comprehensive collection, however, generally requires some philatelic knowledge and will usually contain areas of philatelic studies. Postage stamps are often collected for their historical value and geographical aspects and also for the many subjects depicted on them, ranging from ships, horses, and birds to kings, queens and presidents.\n"}, {"role": "user", "content": "I have a slightly odd hobby. I really enjoy stamp collecting. "}, {"role": "assistant", "content": "Cool, you can also say you're into philately (a word for the study of stamps)."}, {"role": "user", "content": "Oh I didn't realize it had an actual name. That's awesome. Do you know when stamps first started being used?"}, {"role": "assistant", "content": "Well the word is derived from a French word and coined in 1864, so that far back at least. Probably a lot longer since mail has been around a while."}, {"role": "user", "content": "Yeah for sure. I'm trying to get a good collection of old and new. Do you know anything about the most expensive stamp ever?"}, {"role": "assistant", "content": "There is a stamp called Inverted Jenny which is an error where an airplane is printed upside down. A single one was sold for $977,500."}, {"role": "user", "content": "Wow! I don't think I will ever be able to afford anything quite like that hah! Is that the most unique stamp out there?"}, {"role": "assistant", "content": "Well \"invert errors,\" as they are called, are generally quite rare and highly valued."}]