The evidence for psi is dismissed by sceptics with increasingly dogmatic assertions. But that's no surprise because the data in support of phenomena from telepathy to pre-sentience is now openly discussed in leading science journals. The real question, at the forefront of research, is how these experiences can best be understood? In this episode of The Sheldrake-Vernon Dialogues, Rupert Sheldrake and Mark Vernon discuss various possibilities. They draw on the proposals aired at a recent seminar attended by the leading theorists, including Rupert himself. They explore the ideas of practising physicists and biologists working the area, and move onto questions from the nature of time and consciousness to the philosophy of A.N. Whitehead.