We know Olympic athletes would do almost anything for gold, but would they be willing to swim through a river full of faecal bacteria? The river Seine is hosting a number of Olympic and Paralympic events and it's far from pristine. A two-billion-dollar clean up project has been undertaken, but that still might not be enough to fix a waterway that's endured hundreds of years of neglect. Featured: Matt Futterman, journalist, The Athletic.

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