Fight or Flight? Why Our Caveman Brains Keep Getting Confused

Once an evolutionary benefit that helped keep our ancestors alive, cortisol, the hormone that triggers our fight-or-flight response, may now be doing more harm than good. 

Fight or Flight? Why Our Caveman Brains Keep Getting Confused
Once an evolutionary benefit that helped keep our ancestors alive, cortisol, the hormone that triggers our fight-or-flight response, may now be doing more harm than good.