The United States has the biggest discrepancy in health and longevity between our wealthiest and our poorest of any country on Earth.

It's a profound privilege to die from stress related diseases. It is the elimination of other causes of death such as infectious disease which is responsible for bringing lifestyle diseases to the fore - and these are exquisitely sensitive to stress.

As for testosterone, it's gotten a bum rap. Yes, it has tons to do with aggression but it doesn't cause aggression as much as sensitizes you to the environmental triggers of aggression.

As I became more interested in behavior from the standpoint of neurobiology, the stress-response became really interesting. What stress physiology is about is - when there is a new environmental challenge, how does an individual adapt? It seemed like a natural transition.

If we want to make sense of our behavior - all the best, worst, and everything in between - we're not going to get anywhere if we think it can all be explained with one thing, whether it's one part of the brain, one childhood experience, one hormone, one gene, or anything.

It's a profound privilege to die from stress related diseases. It is the elimination of other causes of death such as infectious disease which is responsible for bringing lifestyle diseases to the fore - and these are exquisitely sensitive to stress.