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Does positive thinking work, even if you're one of the country's unluckiest people? Tim Samuels examines how changing your mental state can even improve your body's immune system.

Tim brings Barrie and Margaret and their tales of woe, face-to-face with positive thinking gurus. Will they finally manage to alter their fortunes through a shift of attitude?

Tim also hears from a leading mind-body expert that having the right type of mental state can improve survival rates for serious diseases and lead to better immune systems.

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