The Man Who Tried to Weigh the Soul

In 1907, a Massachusetts doctor named Duncan MacDougall performed an unusual series of experiments. Intrigued by the idea that the human soul had mass, and could therefore be weighed, Dr. MacDougall put together a bed fitted with a sensitive set of beam scales, and convinced a series of terminally ill patients to lie on it during the final moments of their lives.

MacDougall was nothing if not detail-oriented: He recorded not only each patient’s exact time of death, but also his or her tot

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