Another interesting, related fact, that not many people know of: the small photo booths you find on airports, train stations, malls etc., the ones often used to

Another interesting, related fact, that not many people know of: the small photo booths you find on airports, train stations, malls etc., the ones often used to take that classic, romantic strip of pictures with your loved one, or your passport photo and so on, exposes each frame on a special type of transparent, photographic film laid flat onto a strip of photographic paper. The directly exposed paper is the copy you get in the slot, but the reel of film is kept in the machine for "governmental bodies' reference".