IDU: What makes a person good or bad?

You know, it's estimated that the average adult makes up to 35-thousand decisions a day. So chances are...You’re going to make a **really bad one** once in a while...So what affects our everyday decisions and behaviors? And why do we sometimes behave our best and sometimes behave our worst? John A. and Cynthia Fry Gunn professor of biology, neurology and neurosurgery at Stanford University Robert Sapolsky joins William Shatner on this week's episode of "I Don't Understand" to explore what makes a person good or bad.