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As far as the whole 50Hz vs 60Hz thing... if you get headaches at 60Hz, 50Hz will probably be far worse for you. It's like video cards and old CRT monitors- 60Hz may give you a headache. 75Hz was far better. now re have refresh rates anywhere from 120 to 600 hz, and you officially cannot notice anymore.
60Hz makes more sense as it's divisible into the minute and hour, and thus the principle used by many old time device timers that didn't have integrated an quartz oscillator.
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