Looks like this fellow wanted to weight the soul and found it to be… 21g. Yeah. Talk about light-spirited. Hey, to his credit, he did account for sweat, urine, nitrogen and oxygen content in his calculations. But why would a doctor be so curious about weighing the soul? In 1907, America had just experienced the Progressive Era, where topics like women’s rights and spiritualism came largely into play. Survivors of the Civil War lost many loved ones in that tragedy and sought to find ways to communicate with them, so they formed a new ‘religion’ called spiritualism that could allow them to communicate with spirits via trance mediums. Everyone was interested in spirits, and clearly even the scientists and doctors were as well.