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Neurosurgeon Henry Marsh talks to Jim Al-Khalili about slicing through our thoughts, hopes and memories. Brain surgery, he says, is straightforward. It's deciding whether or not to operate that's hard. The stakes are high, it's never clear cut and doctors, he reveals, don't always know the answers. "You couldn't do the work if you didn't have the ability to deceive yourself". First broadcast on The Life Scientific, 30 June 2015.