Déjà vu — we all know it when we feel it, but could we make it happen in someone else? Psychology researcher Anne Cleary figured out a way.

What happens when the technology for manipulation on the neural level becomes possible? Could there be a future therapy for people with depression or PTSD — or heartbreak? Do people really want to have their memories manipulated? Elizabeth Loftus, Steve Ramirez and Xu Liu grapple with some big questions.