‘I didn’t know that!’

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Now we are looking on the crossword clue: ‘I didn’t know that!’.
it’s A 21 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: GEE.

Random information on “Gee”:
Gee was the code name given to a radio navigation system used by the Royal Air Force during World War II.[nb 1] It measured the time delay between two radio signals to produce a “fix”. It was the first hyperbolic navigation system to be used operationally.
Taken from Wikipedia