How it works is that you type in your search term and then click where it says "show options". A menu opens on the left side of the page and you go under standard view to find wonder wheel. I've pasted a screen shot below of one I did for black holes. Wonder wheel does a kind of circular map that categorizes the results in a visual format. You can click on the different spokes of the wheel and get another off-shoot with more sub topics. I tried it with To Kill A Mockingbird also and got some great websites.
It's really fun to play around with. You will also see all these other cool features like the Timeline on this side menu. Think of all the possibilities!