A search for answers - not websites

Along the same lines as Qwiki, is the search engine WolframAlpha. The idea is to give you information about what you are searching for - instead of links. What is really great about this search engine, is that you can type in math equations and it will solve them for you along with accompanying visual aides if available. You can also compare two items by entering them both into the search.  Another nice feature is that it allows you to save the information from any search as a pdf file for future use (or to post on your website as a resource). There are many examples that you can take a look by just clicking on the examples link above the search box. Checking these out will give you a better idea of how to use this tool. This is like a free, updated encyclopedia at the tips of your fingers.  Below is a screen shot of the results when i typed in 2x+10=20