"The warning was stern: Do not enter the water. Not because of the tide. Not because of sharks. Because of the sewage. For almost two centuries, rowers from Oxford University have raced their rivals from Cambridge in a contest that typically ends with jubilant members of the victorious crew jumping into the River Thames in celebration. This year they will be staying as dry as possible. After the discovery of elevated levels of E. coli in the river, rowers have been urged to stay out of the water, to cover any open wounds and to wash themselves down at a dedicated cleansing station at the finish."