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That question is interesting from a techie AI perspective, but irrelevant for end users IMHO. If they want to know when JFK was shot, they'd probably google "jfk shot" or go to his wikipedia page and search in the page for 'shot'.

Getting users to 'unlearn' that behavior and instead use natural language, and then trust the answer is going to be hard IMHO.

Actually..

Ask it "Who killed JFK" too.

He's right. 'JFK' gives me: full name | John Fitzgerald Kennedy date of birth | May 29, 1917 (91 years ago) place of birth | Brookline,Massachusetts,United States date of death | November 22, 1963 (age: 46 years) (45 years ago) place of death | Dallas,Texas,United States

Oh, and (like many topics) it also offers a Wiki link in a sidebar.