If you’ve ever seen a ghost, you have something in common with 18 percent of Americans.
But while there’s evidence that our brains are hardwired to see ghosts, the apparitions we see tend to vary.
Historians who study and catalog ghostly encounters across time will tell you that ghosts come in a range of shapes and forms. Some haunt individuals, appearing in dreams or popping up at unexpected times. Others haunt a specific location and are prepared to spook any passersby. Some are the spitting images of what were once real humans. And then there are the noisy and troublesome poltergeists that appear as uncontrollable supernatural forces instead of people.
