As Parisians gear up for the Olympics to start, one persistent problem is causing a stink, prompting the city Mayor Anne Hidalgo to dive in… To explain, the Seine River – which runs through Paris – will host the Olympics’ outdoor swimming events later this month. The issue is that swimming in the Seine has been banned for more than 100 years thanks to the sewage flowing through it. Officials have spent $1.5 billion to prevent that, but recent water quality tests have still failed. That has International Olympic swimming teams worried – the Aussies are planning to take anti-bacterial meds after their dips, and Britain’s swimmers will load up on probiotics and yoghurt… For her part, Hidalgo was keen to prove that the water was safe – so she took the plunge herself last night – smiling after the experience… “The water is very, very good. A little cool, but not so bad,” she said.