Wolfram Alpha
Wolfram Alpha is a "Computational Knowledge Engine" - different from a search engine, it answers factual queries directly by computing the answer from structured data, rather than providing a list of documents or web pages that might contain the answer.
Wolfram Alpha is available also as mobile app for Android, iPhone, iPad and for ebooks. With Wolfram Alpha on your iPhone or iPod touch, you can explore a vast world of knowledge through an app adapted for your ever-changing, on-the-go lifestyle. Use Wolfram Alpha to discover new information about the world and to deliver expert knowledge into any facet of your mobile life.
