What happened to my Google Adsense Earnings?

For some reason my google adsense earnings appear to have crashed and burned. I don't know what happened. Maybe I'm being penalized for doing reviews? I don't know. I have to admit, I'm not very well versed on the ins and outs of Google, so I really don't know what's going on. My readership stats are still good, but maybe no one is clicking the ads. Perhaps I should experiment by moving my ads around. Any suggestions?

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