Thetan
Thetan in Scientology doctrine
"From some experiments conducted about fifteen or twenty years ago—a thetan weighed about 1.5 ounces [45 grams]! Who made these experiments? Well, a doctor made these experiments. He weighed people before and after death, retaining any mass. He weighed the person, bed and all, and he found that the weight dropped at the moment of death about 1.5 ounces [45 grams] and some of them 2 ounces [60 grams]. (Those were super thetans!)" Although Hubbard did not name the doctor concerned, there was indeed such an attempt, by Duncan MacDougall, to measure the weight of dying patients to determine the weight of the soul, although MacDougall's experiments took place about fifty years before Hubbard's lectures, not fifteen or twenty, and are generally not regarded as having any scientific validity.
Thetan-6