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Natalie Stearn is a sewer technician, also known as a flusher. She manages a team responsible for clearing the sewers of west and central London of 'fatbergs' - massive globs of congealed fat and waste. The work is physically demanding, smelly and it can be quite disgusting - but Natalie can't get enough of it. Outlook's Asya Fouks reports. (Picture: A London sewer flusher with a fatberg. Credit: Adrian Dennis/AFP/Getty Images.)