https://www.sciencedaily.com/releases/2019/02/190206115609.htm > Good Ghosts on the Mountains, Evil Spirits in the Caves > Gray shows how good and evil lead to immortality, and what that means for the afterlife. Pulling from their research To Be Immortal, Do Good or Evil, Gray will discuss why people believe evil spirits reside in places like caves and good spirits are visualized as being in places like mountains.