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Hi all,

No matter how much I try I still can't understand this derivation. It just doesn't make sense to me (pls don't think I'm a geek). I am not trying to discredit Einstein but not able to understand his way of thinking. Anyway I don't have to study physics for long(lol). So, please give me any tips or tricks in understanding this. Your suggestions are valuable.

Thank you so muchjavascript:emoticon(':D')