Scientific Spin Doctors
Personally, I find it profoundly unhelpful for science to label anything that exists outside of its paradigm as a hallucination. I don't know that people are being visited by their dead loved ones, but I also sure as hell don't know that they aren't; and I'm reluctant to put a definitive label on any phenomenon that we don't yet truly understand. A new study shows 60% of adults who've lost a partner experience their presence after they've passed. What that means is up for debate, but I find the possibility of our loved ones' persistence distinctly comforting--as do we all, I'm sure--and I'm willing to entertain the idea of its reality until proven otherwise.
Yours in Impossibility,