WolframAlpha.com is the newest development by Stephen Wolfram. It is an “answer engine” as opposed to a search engine. It’s used to compute answers to questions. Being the idiot that I am, I couldn’t think of anything mathie to type in, so I opted for: “Why did the chicken cross the road?”:
all fairness it’s actually pretty sophisticated tool that can tell you
all sorts of information about science, math, technology, geography,
weather, cooking, business, stocks, travel, music, and much much more.
It uses built-in models of fields of knowledge,
complete with data and algorithms.