Wolfram Alpha : The Computational Search Engine
Netizens from early days were trying to index the data available on the Internet. Mainstream search engines succeeds in fetching results that contain your search string. Then came the era of enhancing web searches by promoting multi search engines like nowgoogle.com
Another service worth mentioning is Yippy which yields results back in clustered sets.
But if you need quantitative data, Wolfram Alpha all the way. It computes your query to provide easily comprehensible results.
Wolfram|Alpha’s long-term goal is to make all systematic knowledge immediately computable and accessible to everyone in real-time. It is useful when we need facts apart from textual web
Elementary Mathematics to Famous Math Problems !
Wolfram Alpha uses "natural language processing algorithms" to find the answers to users’ questions, allowing users to phrase queries as if they were asking a question in a conversation
”Number of people in India” interpreted as India Population yields the result, Long-term population history and Demographics
Climate change in Asia interpreted as Global climate studies Asia
More examples illustrated here
"Wolfram Alpha is built on Wolfram’s earlier flagship product, Mathematica, a complete functional-programming package which encompasses computer algebra, symbolic and numerical computation, visualization, and statistics capabilities. With Mathematica running in the background, it is suited to answer mathematical questions."
Source – Wikipedia
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