Yes, this last question is not on topic here, but has been discussed on many previous threads. Please use the search function (upper right of page) to find them (type "invisible" into the box) and enjoy reading them!
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'Mercy!' cried Gandalf. 'If the giving of information is to be the cure of your inquisitiveness, I shall spend all the rest of my days in answering you. What more do you want to know?' 'The whole history of Middle-earth.. .'
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