what’s the scientific basis behinds these two supernatural afflictions? if you are not from a science background then what is your take on these two phenomenom.

what’s the scientific basis behinds these two supernatural afflictions? if you are not from a science background then what is your take on these two phenomenom.
Just curious about what are the theories paranormal specialist have come up with. I don’t really believe in ghosts but I don’t rule out the possibility entirely.