“How long do you think that body's been here?” Murray asked.

I looked again. Until today, I had only known bones as part of a whole, linked by the wires that keep a laboratory teaching skeleton intact, or as a dynamic living framework connected by ligaments. After death, though, those tissues begin to decay, and soon there is quite literally nothing to hold the bones together. Now I could see that when a corpse is laid out on the ground, gravity sucks the bones downward so that the skeleton eventually collapses, settling into earth made soft and soggy from the decaying tissues. What once was a rib cage becomes a flat row of rib bones, while the spine turns into a collection of disarticulated vertebrae. Of course, the skull and jawbone-mandible, to use the technical term-are easy to spot, but the tiny ligaments that hold our teeth in place also go the way of all flesh. Unless the root's shape keeps it stuck inside the socket, the teeth fall out, too.

“How long has it been here?” Murray repeated.

I took a closer look. The two forearm bones-the radius and ulna-had come completely detached from each other, and there wasn't a single bit of flesh on either the hand bones or the skull. “Six months?” I guessed.

Murray laughed.

“Nine months?” I ventured. “A year?”

He laughed again. “Two weeks,” he told me.

“Two weeks?”

“Because of the maggots.”

“The what?” I looked more closely at the mushy ground and took an involuntary step backward. I hadn't noticed them at first, though I had been puzzled by the shiny little dark-brown shells littering the ground at my feet, but now I saw that all around the periphery of the skeleton were dozens of milky-white, slow-moving maggots, bucking like inchworms, on their way to some unknown destination.

Later I would learn that these little creatures have helped solved many murders. Now, though, I was blissfully unaware that those maggots were a huge part of what lay in store for me as a forensic anthropologist. Murray watched with amusement as I tried to lean closer to see the skull without letting the toes of my brand-new running shoes actually touch anything that seemed even faintly maggot-related.

As Murray and I left the decaying human remains, he explained to me a little of the Body Farm's history. In the early 1970s, the program's chair, Dr. William Bass, ran into a roadblock as he tried to solve a case involving a decomposed body. His interest in the process of human decay was piqued when he realized that, amazingly, no one had ever studied this process before, despite its obvious usefulness in forensic investigation. He also knew that U.T. Knoxville didn't have a modern skeletal collection for him to teach osteology or to use as a forensic anthropology database. The school did have a good collection of bones from Native American archaeological sites, but these were too different in size and shape to be of much use in current forensic research.

So Bass asked the University of Tennessee to give him a small section of land where he could leave human bodies to decompose under natural conditions and then gather the bones for his collection. After all, nature's method of stripping a carcass is fast and efficient, and it doesn't cost a cent. People who had donated their bodies to science found their way onto the Body Farm; so did unidentified and unclaimed corpses from the local medical examiner. Nature did its work-and Dr. Bass and his graduate students were able to document the processes by which bodies decay.

Until Dr. Bass came along, forensic scientists who were asked to establish time since death of a badly decomposed or skeletonized body had to rely upon guesswork and experience, laboriously comparing each new case with earlier solved cases. Now, thanks to Dr. Bass's pioneering work, we have documented scientific studies to back up our hunches. Despite the obvious advantages to this method of study, the University of Tennessee at Knoxville is still the only place in the world where scientists can observe and document the day-to-day journey from death to skeletonization.

Now, as Murray and I walked out from the woods full of corpses into the open field, I saw his look of approval. I hadn't fainted or gasped in horror-on the contrary, I'd been fascinated, drawing nearer for a closer look, even asking an intelligent question or two. All things considered, I'd approached the dead body like a scientist rather than a voyeur-and I realized that I had passed a test. True, I'd seen Murray 's slides and heard his descriptions at his lecture the summer before. But I had to admit, seeing the real thing was something else.

As Murray steered me over to two white cars and opened the trunks to see how the newest body-decay project was going, I couldn't help feeling just a bit triumphant. I knew that Dr. Bass had insisted that I-like all other incoming grad students-be taken out to the decay facility as soon as possible. If I wasn't prepared to deal with decomposing bodies-and with all other aspects of death and decay-it was best to find out now. Well, so far so good. But what other tests were in store for me?

I soon found out. Within only a few weeks, I was told to design and carry out a short-term research project of my own. Since I'd come to the university with an avid interest in facial reconstruction, I thought it would be interesting to document the changes in a person's face as he or she decayed. While still in Georgia, I'd been asked to “restore” faces that were in various stages of decomposition and I'd had some success, both with traditional drawing techniques and with experimental computer enhancement. In my naïveté, I thought that once I established some predictable baseline parameters for facial decomposition, all I'd have to do was take a photo of a dead person's face and perform a simple computer maneuver to make him or her look alive again.

I was wrong. Okay, I was right in theory-but only if I got to the body within the first day and a half. After that, if it was warm and humid enough, the maggots would have done their work and the face would be irrevocably altered, making any photos totally useless for identification purposes.

However, I was still interested in documenting what happened as maggots destroyed a face and, as luck would have it, I got my chance the very next day, when a newly donated body arrived at our lab just hours after the man had died. I positioned the man carefully on his back out in the open field, not too far from the wooded area. Securing his head with a rock on either side, I spread the camera tripod right over his shoulders and pointed the lens down toward his face at a ninety-degree angle. To my satisfaction, I was able to get a shot in before the first fly had landed.

For the next four days and nights, I returned to the body, remounted the camera, and took a new picture-every four hours. I scaled back to every six hours for the next ten days after that. May in Tennessee is indeed hot and humid, so the flies had laid their eggs the same day I put the body there, and by the next afternoon, the man's nose and mouth were bulging with baby maggots and fly eggs. In the middle of the following night, under the stark beam of my flashlight, his lips seemed to move as if he were trying to speak-I even thought I heard him moaning. No, those sounds were mine, involuntary responses to the sight of what had once been a human face being devoured from the inside out.

It took everything I had to focus the camera and zoom in on the maggot masses that were churning inside this man's mouth and nose and under his eyelids, creating this roiling, seething motion as they fed. Lines of ants were streaming up from the ground, ready to devour any maggots unlucky enough to be pushed out toward the edge of the teeming mass. It was a little unnerving to realize that however much we like to think we're at the top of the food chain while we're alive, once we're dead, we're just part of it.