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Jack meets a man who is unable to recognise faces and puts a super-recogniser to the test.
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Dr Jack Lewis also meets an incredible man who woke from a coma to his brain producing a string of lies, he was confabulating.
Jack joins amputees trying to find out why they feel sensations in their missing limbs.
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?