WolframAlpha

Wolfram|Alpha: answers from the computational hive mind. With our massive, crowdsourced collection of real-world data, models, methods and algorithms, you can compute anything in any subject, from algebra to zoology. By gathering and building on systematized knowledge from science, math, language and more, Wolfram|Alpha provides a definitive source for getting real answers to factual queries—putting the world's knowledge at your fingertips.