Wolfram Alpha

This application lets students find information on virtually any subject fast.  It will compute mathematical equations (yes, even calculus) AND it will show the steps for solving.  Students could also search for a famous person, find information about their surname, etc.

Recommended for all grades K-12+

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From Wolfram Alpha: "Wolfram Alpha's long-term goal is to make all systematic knowledge immediately computable and accessible to everyone. We aim to collect and curate all objective data; implement every known model, method, and algorithm; and make it possible to compute whatever can be computed about anything. Our goal is to build on the achievements of science and other systematizations of knowledge to provide a single source that can be relied on by everyone for definitive answers to factual queries."  View the entire "about" section of their website.