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Barry Marshall changed the face of medical science when he swallowed a petri-dish of dangerous bacteria to prove it caused stomach ulcers.

His theory meant that they could be treated with a simple anti-biotic rather than expensive surgery.

Dr Marshall also claimed that his research continues to save up to 500,000 lives per year.

He gave a frank and colourful account of the day he swallowed a petri-dish to Owen Bennett Jones on The Interview.

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