Something been bugging me recently. Has anyone else had this experience? So from time to time, I'll have a conversation with a French person who will ask me a question that I don't know the answer to and will respond, "Je ne sais pas". Then they say, "Si". Excuse me? But, if I don't know the answer, I don't know the answer. What do they mean when they say "yes" after I tell them that I don't know? Is the answer not good enough? Is it not okay that I don't know? For example, someone once asked me what the population of the USA is. I have no idea. "Millions and millions", would have been my response, but instead I told them that I didn't know. And what did they say in return? "Yes" like of course I should know. Why do I get reactions like this?