As far as we know, asking why is something only humans do, so if we want to know why we ask why, it helps to look to the source of what makes us uniquely human. Fortunately, in recent decades, cognitive neuroscientists have come a long way in their efforts to answer this. They've identified the prefrontal cortex (PFC) as the part of our brain primarily responsible for our thinking and acting in ways that differentiate us from other animals. The PFC mediates our ability to plan, conceptualize, symbolize, make rules, and impose meaning on things. It controls our physiological drives and turns
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