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His research experience as a sociologist had led him to the pioneering photographs of Jacob Riis, a police reporter for the New York Tribune.

Riis exposed Lower East Side slum conditions in tenement photographs that would form the basis for his renowned book, “How the Other Half Lives.”

Emil Riis has been withdrawn by Ryan Lowe, with top-scorer Will Keane coming on to replace him.

"The finding is surprising and raises several important questions within this area of research," says Associate Professor Jesper Riis Christiansen of the Department of Geosciences and Natural Resource Management.

"Sarah's findings change our basic understanding and send us back to the drawing board in relation to some of the key mechanisms at play," adds Jesper Riis Christiansen.