Rose
There are no such things as ghosts. All apparent sightings of such things are anecdotal. There are never any objective facts or sensory evidence on which a hypothesis could be based and thence tests set up.
On what grounds do you believe, or seem to, there are from how I read your post?
Hi Susan
I was just using ghosts as an example, scientists look at how those sensations can be recreated in the brain.
The conclusions just in that small idea comes up with ideas ranging from mold to electromagnetic fields to the one in my first link.
http://mentalfloss.com/article/70293/6-scientific-explanations-ghostsIf there is another explanation it might be very hard to pin it down so it can be measured.
We can recreate rainbows and mirages because they are common and we understand why they happen.
We would have to keep looking and stumble across something which would give us a clue as to something else.
I do think it is possible for there to be unusual conditions that create something odd which are hard to pin down and measure. ( like a rare form of mirage etc)
Science just has to keep looking, at everything.
Which I think it does.
I'm open minded about ghosts, Ufos and the rest.
I just don't believe all the hype around them.