The writer on losing his mother to cancer, and on the science of grieving:

My mom died on July 18, 2013, of pancreatic cancer, a subtle blade that slips into the host so imperceptibly that by the time a presence is felt, it is almost always too late. Living about 16 months after her diagnosis, she was “lucky,” at least by the new standards of the parallel universe of cancer world. We were all lucky and unlucky in this way. Having time to watch a loved one die is a gift that takes more than it gives.

Psychologists call this drawn out period “anticipatory grief.” Anticipating a loved one’s death is considered normal and healthy, but realistically, the only way to prepare for a death is to imagine it. I could not stop imagining it. I spent a year and a half writing my mother a goodbye letter in my head, where, in the private theater of my thoughts, she died a hundred times. In buses and movie theaters, on Connecticut Avenue and 5th Avenue, on crosswalks and sidewalks, on the DC metro and New York subway, I lost her, again and again. To suffer a loved one’s long death is not to experience a single traumatic blow, but to suffer a thousand little deaths, tiny pinpricks, each a shot of grief you hope will inoculate against the real thing.