A study conducted by Emory University's Department of Psychiatry and Behavioral Sciences suggests that we may be "hard-wired" to cooperate with each other -- in the sense that we get a shot of seratonin satisfaction upon working with an accomplice to keep your respective mouths shut during an infamous episode of the "prisoners dilemma."

I never understood what the big dilemma was. It seems easy enough to remember to not squeal on your partner and you both can only do better in the long run.

Louise Knapp covered the story for Wired News:
Study: Brains Want to Cooperate.