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For years, the Americans have been using an evil technology called telecine to "convert" 25 fps to 30 fps (actually 23.98 to 29.976 or something) using interlaced imagery. Essentially it plays most frames normally, and generates new frames by combining the field of one image (the field being every other line of the full image) with the alternate field of the next frame, creating a kind of smoother transition. Americans have grown up on it and so are used to it (it's not THAT jarring) but people from PAL regions can tell the difference. In PAL regions all TVs display at least 50Hz (25 full frames a second). Very simply movies are sped up from 24 fps to 25 fps. The difference is small enough that you can't tell, but does make each movie a few minutes shorter.