When the question being asked includes the fact being asked about, did you know is generally used instead. Thus, "Do you know who the president of France is?" but "Did you know that the president of France is d'Estaing?".
Sorani: Lua error in Module:parameters at line 95: Parameter 1 should be a valid language or etymology language code; the value "ku" is not valid. See WT:LOL and WT:LOL/E., Lua error in Module:parameters at line 95: Parameter 1 should be a valid language or etymology language code; the value "ku" is not valid. See WT:LOL and WT:LOL/E.