I Know That The Dead Are Alive

I watched a YouTube video of an excited dog looking at a bubble floating from the ceiling to the floor in someone’s home.  From the dog's perspective, that bubble must have appeared to be a living being.  When the bubble collided with the floor and disappeared, that dog must have thought that he had just witnessed a supernatural event.  We know that this was not a supernatural event.  It can be explained by scientists as a part of nature.  Perhaps, ghosts are like those bubbles.  They are perceived by us to be supernatural actors.  However, ultimately scientists may discover that they are just part of our yet to be explained natural world.