21 grams experiment
An article by Snopes in 2013 said that the experiment was flawed. The methods used were not good, the sample size was too small, and it was not possible to measure weight changes accurately. The article said that we should not believe that his experiments proved anything, “let alone that they measured the weight of the soul as 21 grams.” The fact that MacDougall probably poisoned and killed fifteen healthy dogs to support his research has also been criticized.