Many years ago, I read an article that has stayed with me about a doctor who tried to determine if the soul had weight. Over the years, I have seen that same story retold in various contexts: religious, scientific and New Age pseudoscientific.

You may have seen a film  21 Grams whose title refers to the early 20th-century research of physician Dr. Duncan MacDougall. He attempted to show scientific proof of the existence of the immortal human soul by recording a loss of body weight immediately following death. His hypothesis was that if any small amount of weight was lost at the moment after death, it was due to the departure of the soul.

MacDougall only had six patients in his experiment and the result he selected from one of them was that there was a loss of “three-fourths of an ounce.” That was, to him, the “weight of the soul” and it has since been popularized through the film and online as “21 grams.”

Though MacDougall’s results were published in the peer-reviewed journal American Medicine, his experiment has met with mostly criticism as sloppy research or even pseudoscience.

First off, MacDougall assumed that any weight loss was an indication of the soul, which is not the territory of science. When I first read about this experiment, my own thought was that since energy cannot be created or destroyed and since the living body does create and hold an electrical charge that can be measured, where does that charge go after death?

Talking about this with a friend, he suggested (only part jokingly) that the energy leaves the body at death and joins “The Force” (as in Star Wars) and becomes part of a larger energy field.  I found later that he is not alone in his belief in The Force as a kind of global soul or energy field that can be tapped by all of us – if we know how. In the Star Wars series, The Force is used for both good and evil, but it is never explained as being the soul. Anima mundi is the concept of a “world soul” connecting all living organisms on planet Earth.

I have done further reading over the years about all this and asked a few real scientists that I taught with at NJIT and it seems like a reasonable answer to my question and my friends answer is that the electrical charge gets grounded.

Our bodies generate electricity and that allows your nervous system to send signals to your brain and control the rhythm of your heartbeat, the movement of blood around your body and more.

The Earth also carries an enormous negative charge and our bodies connect with the Earth’s energy. Without getting too New Age, when you put your bare feet on the ground, you absorb large amounts of negative electrons (those are the good ones) through the soles of your feet. This effect maintains your body at the same negatively charged electrical potential as the Earth. This simple process is called “grounding” or “earthing,” and it is viewed as an antioxidant effect.

Dr. MacDougall was pretty careful for his time. He recorded patient’s exact time of death, total time on the bed, used the most precise scales available, recorded any changes in weight that occurred at the moment of death. He thought about other explanations for weight loss (bodily fluids like sweat and urine, and gases like oxygen and nitrogen) and factored that into his calculations.

The only modern experiments I have ever come across about finding the soul or the energy were using a kind of photography that could see energy fields and attempted to see the energy leaving the body. Those were inconclusive. I just recently found that MacDougall did another experiment in 1911 attempting to photograph the soul when it left a body.

He said (and it was reported in The New York Times then, that doing a dozen experiments, he photographed “a light resembling that of the interstellar ether” in or around patients’ skulls at the moments they died.

Science still has no interest in this line of soul research. I doubt that any research was done using a much larger sample size. There is even some controversy as to when the precise “moment” of death occurs. Is it cellular death, brain death, physical death or heart death?

Maybe the soul, if it exists, has no physical form that can be measured.

Dan Brown even references MacDougall’s experiments in his novel The Lost Symbol. A scientist character placed a dying man in an air-tight capsule, fitted with very sensitive micro weight detectors, and after his death showed a difference in weight “though microscopic, is quite measurable.” The novel’s experiment has some of the same flaws as MacDougall’s experiment.

But wouldn’t it be comforting to prove that we each have a souls that lives on after we die?

We have been considering this idea of a soul for a very long time. Religious, philosophical and mythological traditions often view the soul (perhaps by a different name) as  essence of a living being and it can be mortal or immortal.

In Judeo-Christianity, only human beings have immortal souls. Thomas Aquinas attributed soul/anima to all organisms but argued that only human souls are immortal. Hinduism and Jainism hold that all biological organisms – your pets and the flea on your dog – have souls. Aristotle also believed that. In some philosophies (animism), even non-biological entities – rivers and mountains – have souls.

Science still isn’t interested. I have read that functional neuroimaging has mapped every function once associated with the soul to specific regions and structures of the brain.

Physicists have mapped the connections between subatomic particles and need no spiritual explanations. But they have also said that dark matter makes up more than 80 percent of the universe’s mass, but we haven’t actually seen a single atom of it. That requires at least some non-religious faith.

I agree with Hamlet that still “There are more things in heaven and earth, Horatio, Than are dreamt of in your philosophy.”