YourNextRead Tells You What Book You Should Read Next

It has some interesting recommendations. I entered "Gravitation" by Misner, Thorne, and Wheeler, which is a thick graduate level and beyond text on general relativity (and a significant source of gravitation itself...bookstores have to make sure they don't stock two or more copies next to each other or they risk forming a black hole).

It recommended several other advanced physics books, plus "Ender's Game" by Card. I suppose that makes sense. If you've made it through MTW, you should take a break.

It had no recommendations based on the 3rd editing D&D Player's Handbook. It had plenty of recommendations based on "Tom of Finland XXL". I had expected the opposite result.

In fact, it seemed pretty good at finding recommendations when I gave it gay underground sex comix (e.g., the Meatmen series), but failed miserably at straight underground sex comix (Lonely Nights, Omaha, for example). This probably says something, but I'm not sure what.