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The latest project by Stephen Wolfram is defined as the first "computational knowledge engine", something capable of answering factual question for you.
The Wolfram engine is described as "a proprietary system based on fields of knowledge, containing terabytes of curated data and millions of lines of algorithms to represent real-world knowledge as we know it".
Two days ago Stephen Wolfram gave an early preview of his "computational knowledge engine" Wolfram Alpha at a talk at Harvard University.
The video of the whole presentation (1h 45min long) is here above, while down below you can find some highlights I transcripted from his speech.
Learn more about Mathematica and other Wolfram products in these screencasts and videos, which include introductions, tutorials, user stories, uses, and examples. Topics covered range from basic introductions and capabilities to educational uses to high-level Mathematica programming.
Mathematica is a computational software program used in scientific, engineering, and mathematical fields and other areas of technical computing. It was conceived by Stephen Wolfram and is developed by Wolfram Research of Champaign, Illinois.[2][3]