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Actually, the 24 frames per second that movies run at is neither an NTSC nor PAL standard. PAL runs at 25 frames per second/50 fields per second, and NTSC runs at 29.97 frames per second/59.94 fields. NTSC at least uses the telecine process to give us the correct number of frames per second. De-interlacers actually do reverse telecine to get the original 24fps back. I'm not as familiar with PAL video production, but no doubt they have something similar. Progressive scan displays advertise 60 frames per second, because they do not run interlaced and thus can display a frame rather than a field. In general, you're not likely to notice unless the display is interlaced or - in the case of a CRT - uses phosphors where you can detect the dimming between each vertical retrace.