A thread on paranormal and supernatural stuff.
I personally see it that ghosts/paranormal/etc do not exist, and never have done, them arising from tales and legends in the past.
For example, one might say ghosts have the ability to go through walls and can float about. However were this possible, then the earth would rotate around the sun and leave the ghost to drift aimlessly in the vacuum of space.
If the ghost had mass however to pull it to the earth, then if it were able to go through solid objects it would be sucked down into the centre of the earth.
I think that the explanation for people to believe in ghosts is many, ranging from loss of a loved one that cannot be accepted to a simple fear of a wild animal intending to cause harm. (Look behind you, even if you don't look, you feel a compulsion to look behind you despite knowing nothing is behind you.) The heightened alertness humans had in the stone age may have caused them to see and hear things not there, which may have helped in a number of cases with regards to survival. (And probably the reason for the arising of things such as religion or psyhics.)
Whilst ghosts have been well documented throughout history, so has stories of fire breathing dragons or one eyed giants. Many cases can be ascribed to many fascinating mental illness- I mean insights into the supernatural.
Sleep paralysis is something well understood and documented now, along with seeing things out the corner of the eye, hallucinations, paranoia, ailments such as Ergotism (This causing hallucinations due to poisioning from various grain products infected with http://en.wikipedia.org/wiki/Claviceps_purpurea ) In the past however, these were not yet well understood. Often they were attributed to anything from ghosts to the devil.
Today unfortuately we still have people who place ghosts as the first cause of something rather than look for a natural explanation. (For there is no supernatural, only the natural not yet explained.) We unfortuately still have assholes who pretend to speak to dead people for the greiving whom wish to talk to loved ones. Weegee boards are still mass produced with the genuine belief that they can be used to communicate with the dead. Frankly this is disgusting and shameful behaviour, as these frauds are making up lies in order to deceive people (Ones who relatives died no less) in order to acquire money.
That is my rant. The human brain is an organic organ that ceases activity on death, and does not create a spirtual entity that haunts the world. (Plus come to think of it, why would they communicate to us in such bizarre ways such as weegee boards or scaring the shit out of family members?)