Over the years, a large body of work has been devoted to studying PTSD symptoms in second-generation survivors, and it has found signs of the condition in their behavior and even their blood — with higher levels of the stress hormone cortisol, for example. The assumption — a perfectly reasonable one — was always that these symptoms were essentially learned. Grow up with parents afflicted with the mood swings, irritability, jumpiness and hypervigilance typical of PTSD and you're likely to wind up stressed and high-strung yourself.

Now a new paper adds another dimension to the science, suggesting that it's not just a second generation's emotional profile that can be affected by a parent's trauma; it may be their genes too. The study, published in the journal Biological Psychiatry, was conducted by a team led by neurobiologist Isabelle Mansuy of the University of Zurich. What she and her colleagues set out to explore went deeper than genetics in general, focusing instead on epigenetics — how genes change as a result of environmental factors in ways that can be passed onto the next generation.

"We saw the genetic differences both in the brains of the offspring mice and in the germline — or sperm — of the fathers," says Mansuy.

On a day-to-day basis, most of us conduct ourselves as though we were not at war with two countries. Ilona Meager points out in her book, “Moving A Nation to Care,” “those on the home front have not been asked to do anything out of ordinary, or give up anything extraordinary for our soldiers in battle.”

A former Army soldier seeking help for mental problems at a Georgia military hospital took three workers hostage at gunpoint Monday before authorities persuaded him to surrender.

No one was hurt and no shots were fired in the short standoff at Winn Army Community Hospital on Fort Stewart,

The suspect walked into the hospital's emergency room at about 4 a.m. local time carrying two handguns, a semiautomatic rifle and a semiautomatic version of a submachine gun, Phillips said. He took a medic hostage and headed to the building's behavioral treatment wing on the third floor.