On March 11, 1907 the first scientific study of the soul was published in The New York Times. The article is below (double click on image to enlarge):
Dr. Duncan MacDougall claimed to have discovered that at the moment of death we lose 21 grams of weight, which he believed was the approximate weight of the soul. However there are problems with this study. To read about these problems, read the following articles:
21 Grams
Soul Man