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Google, Bing, Wolfram Alpha, and Siri all parse that query properly and answer it perfectly. Do you have an example of something Cyc does that none of those services do?

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Cyc is used in the MathCraft application, which is currently in beta:

http://www.cyc.com/mathcraft/

I don't think Google, Bing, Wolfram Alpha, or Siri can be used for applications like this.

Wolfram Alpha + Wolfram Mathematica certainly could.

And it's worth noting that Google and Bing generate that answer without human intervention, so no complex data engineering etc..

Do they really though?

Not really, Google Knowledge Graph is an ages-old project and the side-panel "fact sheets" have involved manual curation of the automated results.

There's manual curation of the schemes which map some human-eneterd data on web pages to facts, but the extraction is automatic.

See [1], noting that human annotation is responsible for 250K of the 100 million high confidence facts in the system.

I believe they have some manual overrides in a few cases, but the system itself is automatic.

[1] https://research.google.com/pubs/pub45634.html

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