21 grams experiment
The 21 grams experiment was a scientific study. It was published in 1907. The author was Duncan MacDougall. He was a physician from Haverhill, Massachusetts. MacDougall thought that souls have physical weight. He tried to measure the mass lost by a human when the soul left the body. MacDougall tried to measure the mass change of six patients at the moment of death. One of the six subjects lost three-quarters of an ounce (21.3 grams).