I don't really get into many converstations at parties etc. Most of my intellect is done on a one or one.
If I was at a party and there was a conversation that interest me and I heard someone say something that I think is wrong and I know the true answer I would debate the issue with them and prove them wrong.
Yep the Sag in me is very sociable..and the scorpio in me is very aggressive..I usually make people laugh by my sarcastic remarks..I give destructive criticism..and everyone knows it..
But in answer to your question, usually if a subject interests me then I am an expert at it..I will learn everything..I wish I had become a brain surgeon..well I guess its never too late to start..the mind intrigues me..the workings of it..