Please help me to choose a topic for google adsense

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Dear All, Have any one here tried google adsense? I think it is a good method to make extra money online. So I am going to set up my own website to put google adsense on it. But you should know that I have to choose a topic which can attract more and more people to click my ads and what's more, price per click should be high. I know it is hard. But maybe you can help me. Best Regards, Peter