"The hypothesis of the soul, on the other hand, has not once in all of human history been supported by good, solid scientific evidence. That's pretty surprising when you think about it. For decades, and indeed centuries, most scientists had some sort of religious beliefs, and most of them believed in the soul. So a great deal of early science was dedicated to proving the soul's existence, and discovering and exploring its nature. It wasn't until after decades upon decades of fruitless research in this area that scientists finally gave it up as a bad job, and concluded, almost unanimously, that the reason they hadn't found a soul was that there was no such thing."