I find your physics lesson very enlightening, but I am still unable to enjoy reading on a tablet. On the other hand, I have no problem using light on my e-readers (with or without colour). Sorry, it must be because of my special chemistry or a psychological issue. So I will never read on a tablet (or a smartphone). But if I enjoyed reading on these devices, I wouldn't buy an e-reader because it wouldn't bring me anything special.
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