This is cool. A scientific explanation for why people "see" apparitions:
[ Scientific American ] So far, they have found evidence that some apparitions may be brain benders caused by spiking EMFs (electromagnetic fields), and possibly even extremely low-–frequency sound waves (known as infrasound) so subtle that the ear does not register them as noise.

EMFs emitted by power lines and towers, clock radios and other electrical sources may help debunk myths that people or things are haunted...