Today, Olympics officials in Paris postponed the men’s triathlon because of elevated E. coli levels in the River Seine, where the event was set to take place. WSJ’s Joshua Robinson reports on how decades of trying to clean up the river may not have been successful.  Further Reading: - Paris Olympics Postpones Triathlon Because of Pollution in River Seine  - Yes, They’re Actually Doing Olympic Swimming in the River Seine. Gulp.   - Herculean Feat in Paris Olympics: Make the Seine Safe to Swim   Further Listening: - Simone Biles and the Power of Saying No  Learn more about your ad choices. Visit megaphone.fm/adchoices