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Jack joins amputees trying to find out why they feel sensations in their missing limbs.
Dr Jack Lewis also meets an incredible man who woke from a coma to his brain producing a string of lies, he was confabulating.
Dr Jack meets extreme risk taker Matthew Adams. Will tests at the University of Cambridge show that Matthew has a different brain from non-risk taking Jack?
Jack meets a man who has bizarre hallucinations and witnesses cutting edge surgery.