As a graduate student at the University of Wisconsin during the final years of the Vietnam War, Pauline Boss learned that not all grief journeys look the same.
While losing a loved one is universally searing and life-altering, Boss found that those with a family member identified as "Missing in Action" faced a unique kind of hell.
With no official proof that their soldier was alive or dead, and no opportunity for a funeral or other ritual of support, their pain, Boss said, "went on and on and on."
Boss gave a name to this unsettling and uncharted territory: ambiguous loss.
For more than 40 years, she has broadened her research on ambiguous loss to natural disasters such as earthquakes and floods, to 9/11, to airline crashes, to Alzheimer's and other illnesses that take away a loved one's mind or memory.
And to abductions.
I called Boss because I was thinking, again, of the family of Jacob Wetterling, forced to navigate ambiguous loss for more than 26 years.
"I don't want to say that one kind of loss is harder than another, but ambiguous loss is the most stressful kind of loss," said Boss, professor emeritus in the Department of Family Social Science at the University of Minnesota, who asked to speak in generalities only.