About fifty years ago, Dr. Bruce Greyson was eating pasta in the hospital cafeteria when his beeper went off. Greyson, a psychiatrist, was urgently needed in the ER to treat a college student who had overdosed. He called her name "Holly" " and tried to rouse her. But she didn't stir. The next morning, Greyson returned to work at the hospital. Holly stirred. "I remember you from last night," she mumbled. "I saw you talking with Susan, sitting on the couch." Suddenly Holly opened her eyes, looked Greyson in the face and added, "You were wearing a striped tie that had a red stain on it." Greyson began studying these so-called near-death experiences (NDEs) from a scientific standpoint, collecting hundreds of stories from those who've had them. He discovered that ... many people who survive the jaws of death report strange out-of-body experiences. Since meeting Holly, Greyson has published hundreds of academic papers. His search for answers is chronicled in his new book "After: A Doctor Explores What Near-Death Experiences Reveal about Life and Beyond." Near-death experiences are fairly common. Some 10 percent to 20 percent of people who come close to death report them " about 5 percent of the population. So what is going on? Greyson, who grew up in a scientific household and is not religious, says he doesn't know. "But I think the evidence overwhelmingly points to the physical body not being all that we are," he says. "There seems to be something that is able to continue after the body dies."