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Dick and Dom describe the life and work of 'Absolute Genius', Joseph Bazalgette. He lived in a time before sewers, in which toilet waste was disposed of into the nearest river. This caused the 'Great Stink’ in London in 1858, in which many people became sick and died.

Dick and Dom visit a laboratory and look at a stool sample under the microscope to see the bacteria present. They then visit the first sewer that Bazalgette designed. It took 10 years and 318 million bricks to build. The key scientific points are made in a fun and student-friendly way.