In the 1860s, William Mumler photographed ghosts-or so he claimed. Faint images of the dearly departed lurked in the background with the living, like his well-known photo of the recently assassinated Abraham Lincoln comforting Mary Todd. The practice came to be known as spirit photography, and some believed Mumler was channeling the dead. Skeptics, however, called it a fraudulent trick on the gullible, taking advantage of the grieving at a time of suffering and loss...
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