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I guess some people have the fortitude to read for long periods time on an LCD screen that way but it's not something I can do or interested in... and I'm only 31. Maybe I'm an old fart for my age or something I don't know.
All the power to you I guess.
You certainly aren't an "old fart".
I'm 26 and for work reasons I spend a lot of time looking at a bright screen in a dark room, or looking directly into a microscope, and for me my eyes get tired real real fast when reading plain text on a screen. Makes it quite difficult to proof-read manuscripts for example.
e-ink doesn't have this problem and I can read for hours on end with my kindle 2 and my eyes don't get any more tired than they would on a plain paper book.