Not sure what to think of Adsense at the moment. I have a website with free educational materials such as worksheets and workbooks. I have thousands of resources which are all original and made by myself over the years. Free to download for all. Since a week or two I see that both my visitors numbers and the adsense CTR and CPC are getting lower and lower. June started with the lowest RPM I have ever experienced. What's going on here? Usually all the stats are pretty stable and now suddenly a drop in everything. Any suggestions or comments?