Lately, I’ve had a few negative experiences, especially related to general knowledge. Sometimes, a girl seem "really" interested in you, but during a conversation (in group for example) the topic shifts to something you’re not really familiar with like law, history, .... etc or anything you haven’t really explored.

Then she asks you or someone asks you a question, and you realize you have no idea what to say.

It becomes obvious that you’re not informed on the topic!! that can makes her lose interest.... in many times by experience !!!

Have you ever experienced that? How do you usually handle such situations? How do you behave if you don't know things ?