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In an example of early trick photography, a ghost appears to visit a young girl beside her bed (Photo circa 1860-1869, London, England). | Hulton-Deutsch Collection/Corbis
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Ghost Stories: The Science Behind Sightings

There is no scientific evidence of a supernatural explanation for ghost sightings. But the parapsychologists have their arguments, too.

October 29, 2013
9:00 AM EDT
| Elisa Lazo de Valdez/Corbis
In an illustration from 1874, Anne Morgan -- said to have been dead for two centuries -- reveals herself under the name of "Katie King," through spiritualistic mediums to ghost seekers in Philadelphia | Corbis
Taken in Norfolk, England, in 1936 by Capt. Hubert C. Provand, the so-called "Brown Lady Ghost" photo was published in Country Life magazine. | Wikimedia Commons