Mind Reading

My friend asked me the other day if I wanted the power to read selectively read people's minds. At first I didn't know how to respond to that or if I even wanted that ability. Then he continued to explain himself that he was always curious as to what certain people were thinking at that point in time...but not to use the information in any malicious way...he wanted to study physical motions and actions and how and if they related to the thoughts that are running in a person's mind. If someone bit their lip...is there a consensus about what that gesture meant? Does it mean she's timid...not listening...not caring..or have thoughts about something else...or if twirling your hair meant that you were self conscious at that second...I think I would rather not have that power to read a person's thoughts and let everything in life be a mystery...otherwise what would the fun in life be...I like to trust people and believe what they say and hope to think that they would be as honest with me as I would be with them...so no I don't think I want to know what you are thinking and having that power would only lead to abuse of it...