Eavesdropping

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I think we all happen to hear something, but do you know that you can benefit from eavesdroping one day. Once I read a book which account the ways of memory, and eavesdropping is related in this book, it is one of the ways of memory. If you persist in, which will improve your memory power! Once I dit it, but I failed finnaly, for I do not have engouh persistance. So how do you think of it?---Eavesdropping. Are you benefit from it?