Perhaps you could explain to me about search egines. Why is it that when I want to search with Dr. Google, Prof. Yahoo search engines come up to my unwanted rescue? I have no issues with Yahoo, but I get confused when this go-to things appear. I think I should read what's before be on the screen-- allowing me the choice with my easy-click key-taps every time I search. Can I search on both, Yahoo and Google? Is there permanence in which search engine I choose to ask first? Can I opt out of the search engine whenever I want to?