http://www.wolframalpha.com/ Well I assume quite a few people know about this but I tired it out today and this site is god-like. For people who study math or science this site can tell you the answer and show you how to do it. It also accepts images of questions and other amazing things. Now a site that can do that by simply typing that into search. I'm sure anyone in final years of school or in uni can appreciate how great this site is.Thanks for reading.