A new study out of Yale University, and reported by StudyFinds.org, found that it takes more, quote, "brain real estate" to argue with someone than to agree with them.
When you're arguing, you constantly have to think of brilliant things to try to make your point. When you're agreeing with someone, your brain can just relax.
In fact, the researchers say that when you agree with someone, your brains basically sync up like a, quote, "musical duet" and you feel calmer.